Biology
Chemistry
AP Chemistry
English
AP English Literature
Chemistry
Dec 4, 2025
6
3 pages
Stephanie๐ @stephanie_071607
Unit conversions and density calculations are essential skills in science that help us translate measurements between different systems.... Show more
Ever wonder how scientists work with different measurement systems? Unit conversions help translate between them! Let's see how it works with some examples.
To convert units, we use conversion factors where we multiply by a fraction that equals 1. For instance, when converting 100 km to meters, we multiply by because this equals 1, giving us 100,000 meters.
Weight conversions follow the same pattern. Converting 5 lbs of chicken to grams means multiplying by , resulting in 2268 grams. For height, we might need multiple steps - like converting 6 ft to cm by first changing to inches , then to centimeters .
Pro Tip When setting up unit conversions, write out all your units to make sure they cancel properly. The units you start with should cancel out to leave you with the units you want!
Volume and time conversions work similarly. For volume, we might convert 12,000 ml to gallons through liters first. With time, we can convert seconds to days by stepping through minutes and hours as intermediate units.
Temperature scales are used differently around the world, so knowing how to convert between them is super useful! The three main scales are Celsius, Fahrenheit, and Kelvin.
To convert from Celsius to Fahrenheit, use the formula F = (9/5)C + 32. For example, 100ยฐC becomes 212ยฐF. Going from Fahrenheit to Celsius, rearrange to C = (5/9), which turns 30ยฐF into -1.11ยฐC.
The Kelvin scale is used in science because it has no negative temperatures. To convert from Celsius to Kelvin, simply add 273.15 . So -250ยฐC becomes 23.15 K. Going from Kelvin back to Celsius means subtracting 273.15.
Remember The Kelvin scale has the same size degrees as Celsius, but starts at absolute zero instead of the freezing point of water!
Density conversions involve both mass and volume units. When converting densities like 7.6 g/ml to lb/cc, you'll need to convert both the top (mass) and bottom (volume) parts of the fraction separately.
Density tells us how much mass is packed into a given volume, and it's calculated using the formula Density = Mass/Volume. This relationship can help solve various practical problems.
When given mass and volume measurements, calculating density is straightforward. For example, a 24g metal cube with 3cm sides has a volume of 27cmยณ, making its density 0.89 g/cmยณ. Similarly, 25g of liquid with a volume of 20ml has a density of 1.25 g/ml.
The density formula can be rearranged to solve for mass or volume when needed. If you know ethanol has a density of 0.89 g/ml, you can find that 10ml of ethanol has a mass of 8.9g. Or if a copper alloy has a density of 4.6 g/ml and a mass of 12g, its volume must be 2.61ml.
Quick Check Always make sure your units match when solving density problems! If density is in g/ml, your mass should be in grams and volume in milliliters.
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help โ all at your fingertips.
0
Smart Tools NEW
Transform this note into: โ 50+ Practice Questions โ Interactive Flashcards โ Full Mock Exam โ Essay Outlines
The Nature of Light / Atomic Spectra / The Wave-Particle Duality of Matter and Energy / The Quantum-Mechanical Model of the Atom
AP ChemistryCombination notes of all Honors Chemistry Units.
Chemistryincludes: chem intro, balancing equations, mole and molar mass, stoichiometry, limiting reactants, energy/coulombโs law, subatomic particles, isotopes, and ions.
AP ChemistryLearn how calcium, fluorine, aluminum, and sulfur form bonds through Lewis Dot structures and electron gain/loss.
Chemistrygives simple explanations, shows examples and gives small tips
ChemistryExplore the fascinating world of polymers and their formation through polymerization. This summary covers key concepts such as monomers, the polymerization process of ethene, and the distinction between natural and synthetic polymers. Ideal for students studying chemistry and materials science.
ChemistryApp Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think itโs very much worth it and youโll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help๐ค๐ค
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as Iโve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think itโs very much worth it and youโll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help๐ค๐ค
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as Iโve seen! Geometry too!
Paul T
iOS user
Stephanie๐
@stephanie_071607
Unit conversions and density calculations are essential skills in science that help us translate measurements between different systems. These exercises will help you practice converting between metric and imperial units, working with temperature scales, and solving density problems.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Ever wonder how scientists work with different measurement systems? Unit conversions help translate between them! Let's see how it works with some examples.
To convert units, we use conversion factors where we multiply by a fraction that equals 1. For instance, when converting 100 km to meters, we multiply by because this equals 1, giving us 100,000 meters.
Weight conversions follow the same pattern. Converting 5 lbs of chicken to grams means multiplying by , resulting in 2268 grams. For height, we might need multiple steps - like converting 6 ft to cm by first changing to inches , then to centimeters .
Pro Tip: When setting up unit conversions, write out all your units to make sure they cancel properly. The units you start with should cancel out to leave you with the units you want!
Volume and time conversions work similarly. For volume, we might convert 12,000 ml to gallons through liters first. With time, we can convert seconds to days by stepping through minutes and hours as intermediate units.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Temperature scales are used differently around the world, so knowing how to convert between them is super useful! The three main scales are Celsius, Fahrenheit, and Kelvin.
To convert from Celsius to Fahrenheit, use the formula F = (9/5)C + 32. For example, 100ยฐC becomes 212ยฐF. Going from Fahrenheit to Celsius, rearrange to C = (5/9), which turns 30ยฐF into -1.11ยฐC.
The Kelvin scale is used in science because it has no negative temperatures. To convert from Celsius to Kelvin, simply add 273.15 . So -250ยฐC becomes 23.15 K. Going from Kelvin back to Celsius means subtracting 273.15.
Remember: The Kelvin scale has the same size degrees as Celsius, but starts at absolute zero instead of the freezing point of water!
Density conversions involve both mass and volume units. When converting densities like 7.6 g/ml to lb/cc, you'll need to convert both the top (mass) and bottom (volume) parts of the fraction separately.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Density tells us how much mass is packed into a given volume, and it's calculated using the formula Density = Mass/Volume. This relationship can help solve various practical problems.
When given mass and volume measurements, calculating density is straightforward. For example, a 24g metal cube with 3cm sides has a volume of 27cmยณ, making its density 0.89 g/cmยณ. Similarly, 25g of liquid with a volume of 20ml has a density of 1.25 g/ml.
The density formula can be rearranged to solve for mass or volume when needed. If you know ethanol has a density of 0.89 g/ml, you can find that 10ml of ethanol has a mass of 8.9g. Or if a copper alloy has a density of 4.6 g/ml and a mass of 12g, its volume must be 2.61ml.
Quick Check: Always make sure your units match when solving density problems! If density is in g/ml, your mass should be in grams and volume in milliliters.
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help โ all at your fingertips.
0
Smart Tools NEW
Transform this note into: โ 50+ Practice Questions โ Interactive Flashcards โ Full Mock Exam โ Essay Outlines
The Nature of Light / Atomic Spectra / The Wave-Particle Duality of Matter and Energy / The Quantum-Mechanical Model of the Atom
AP ChemistryCombination notes of all Honors Chemistry Units.
Chemistryincludes: chem intro, balancing equations, mole and molar mass, stoichiometry, limiting reactants, energy/coulombโs law, subatomic particles, isotopes, and ions.
AP ChemistryLearn how calcium, fluorine, aluminum, and sulfur form bonds through Lewis Dot structures and electron gain/loss.
Chemistrygives simple explanations, shows examples and gives small tips
ChemistryExplore the fascinating world of polymers and their formation through polymerization. This summary covers key concepts such as monomers, the polymerization process of ethene, and the distinction between natural and synthetic polymers. Ideal for students studying chemistry and materials science.
ChemistryApp Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think itโs very much worth it and youโll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help๐ค๐ค
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as Iโve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think itโs very much worth it and youโll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help๐ค๐ค
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as Iโve seen! Geometry too!
Paul T
iOS user
Algebra
Calculus 1
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