Units & Measurement
Learn about the units used in chemistry, how to convert between them, how to take measurements, and how to make basic calculations.
Significant Figures
These are examples of significant figure, accuracy, and precision problems, with links to other worked chemistry problems and homework help.
These are examples of significant figure, accuracy, and precision problems, with links to other worked chemistry problems and homework help.
Scientific Notation
Scientific notation uses exponents to express numerical figures. Here's an explanation of what scientific notation is, plus examples of how to write numbers and perform addition, subtraction, multiplication and division problems using scientific notation.
Scientific notation uses exponents to express numerical figures. Here's an explanation of what scientific notation is, plus examples of how to write numbers and perform addition, subtraction, multiplication and division problems using scientific notation.
Significant Figures in Measurements and Calculations
This article discusses the use of significant figures in taking measurements and performing calculations. Learn about significant figures, uncertainty, accuracy, precision, rounding, and truncating. Losing significant figures and effects of exact numbers are also described.
This article discusses the use of significant figures in taking measurements and performing calculations. Learn about significant figures, uncertainty, accuracy, precision, rounding, and truncating. Losing significant figures and effects of exact numbers are also described.
Metric Units - Base Units
The metric system or SI (from Le Système International d'Unités.) is based on seven base units. These units describe the basic properties on which all other measurements are based.
The metric system or SI (from Le Système International d'Unités.) is based on seven base units. These units describe the basic properties on which all other measurements are based.
Metric Units - Derived Metric Units
Many metric units used in science have specialized names for the values they represent. They are considered derived units and can still be reduced to factors of the seven base units. This table lists many of these units and their corresponding base unit values.
Many metric units used in science have specialized names for the values they represent. They are considered derived units and can still be reduced to factors of the seven base units. This table lists many of these units and their corresponding base unit values.
Metric Unit Prefixes
Metric units of measurement are all based on units of ten. Here is a list of the most common metric unit prefixes.
Metric units of measurement are all based on units of ten. Here is a list of the most common metric unit prefixes.
Metric Prefixes Quiz
How well do you know your metric prefixes? Quiz yourself with this ten question multiple choice self-test.
How well do you know your metric prefixes? Quiz yourself with this ten question multiple choice self-test.
Unit Conversions
These are examples of unit conversion problems, with links to other worked chemistry problems and homework help.
These are examples of unit conversion problems, with links to other worked chemistry problems and homework help.
Metric to Metric Conversions - Unit Cancelling Method
Here is a step by step example of a conversion between metric units. This illustrates how to cancel units to convert measurement units.
Here is a step by step example of a conversion between metric units. This illustrates how to cancel units to convert measurement units.
English to Metric Conversions - Unit Cancelling Method
Here is a worked example of how to convert English to Metric measurement units using the unit cancellation method. This example converts yards to meters.
Here is a worked example of how to convert English to Metric measurement units using the unit cancellation method. This example converts yards to meters.
Unit Conversion Worksheets
Use these printable worksheets to practice unit conversions. These pdf questions and answers will test your understanding of metric-metric, metric-English, and temperature conversions.
Use these printable worksheets to practice unit conversions. These pdf questions and answers will test your understanding of metric-metric, metric-English, and temperature conversions.
Table of Physical Constants
Need a value for a fundamental physical constant? This handy reference table contains commonly used physical constants used in chemistry.
Need a value for a fundamental physical constant? This handy reference table contains commonly used physical constants used in chemistry.
Temperature Conversions
These are examples of temperature conversion problems, with links to other worked chemistry problems and homework help.
These are examples of temperature conversion problems, with links to other worked chemistry problems and homework help.
Temperature Converter
Here's a handy online converter for temperatures. Simply enter your known temperature (Kelvin, Celsius, Fahrenheit) and the other values will appear. It's much easier than trying to remember the formulas or do the math!
Here's a handy online converter for temperatures. Simply enter your known temperature (Kelvin, Celsius, Fahrenheit) and the other values will appear. It's much easier than trying to remember the formulas or do the math!
Pressure Conversions
Here are some examples of conversions between units of pressure (kPa, atm, mm Hg).
Here are some examples of conversions between units of pressure (kPa, atm, mm Hg).
Area, Perimeter & Volume Formulas
Perimeter, surface area and volume formulas are used for many chemistry calculations. You may need to find surface area and volume to determine density and concentration, for example. While it's a good idea to memorize these formulas, here a list of formulas to use as a handy reference.
Perimeter, surface area and volume formulas are used for many chemistry calculations. You may need to find surface area and volume to determine density and concentration, for example. While it's a good idea to memorize these formulas, here a list of formulas to use as a handy reference.
Mole - Gram Conversions
These are examples of mole-to-gram and gram-to-mole conversions, with links to other worked chemistry problems and homework help.
These are examples of mole-to-gram and gram-to-mole conversions, with links to other worked chemistry problems and homework help.
Basic Online Calculator
Sometimes you just need to use a quickie calculator! Here's one for addition, subtraction, multiplication, and division.
Sometimes you just need to use a quickie calculator! Here's one for addition, subtraction, multiplication, and division.
Constants, Prefixes, Conversion Factors
This is a set of tables with some useful physical constants, conversion factors, and unit prefixes. They are used in many calculations in chemistry, as well as in physics and other sciences.
This is a set of tables with some useful physical constants, conversion factors, and unit prefixes. They are used in many calculations in chemistry, as well as in physics and other sciences.
How to Read a Meniscus
The meniscus is the curve seen at the top of a liquid in response to its container. When you read a scale on the side of a container with a meniscus, such as a graduated cylinder or volumetric flask, it's important that the measurement accounts for the meniscus. Here's how to read a meniscus.
The meniscus is the curve seen at the top of a liquid in response to its container. When you read a scale on the side of a container with a meniscus, such as a graduated cylinder or volumetric flask, it's important that the measurement accounts for the meniscus. Here's how to read a meniscus.
Metric Conversion Quiz
Test your ability to make metric-to-metric conversions with this quick quiz.
Test your ability to make metric-to-metric conversions with this quick quiz.
Measurements & Conversions Quiz
Take a multiple choice quiz to test your comprehension of units, conversions, and significant figures.
Take a multiple choice quiz to test your comprehension of units, conversions, and significant figures.
Perimeter and Surface Area Formulas
Perimeter and surface area formulas are part of the math used in common science calculations. You While it's a good idea to memorize these formulas, here is a list of perimeter, circumference and surface area formulas to use as a handy reference.
Perimeter and surface area formulas are part of the math used in common science calculations. You While it's a good idea to memorize these formulas, here is a list of perimeter, circumference and surface area formulas to use as a handy reference.
Surface Area and Volume Formulas
Surface area and volume formulas are part of the math used in common science calculations. You may need to calculate surface area and volume to determine density, pressure and concentration, for example. While it's a good idea to memorize these formulas, here a list of surface area and volume formulas to use as a handy reference.
Surface area and volume formulas are part of the math used in common science calculations. You may need to calculate surface area and volume to determine density, pressure and concentration, for example. While it's a good idea to memorize these formulas, here a list of surface area and volume formulas to use as a handy reference.
Units of Measurement Quiz
How well do you know the basic units of measurement? Here's a ten question quiz covering both metric and English units that you can take to test yourself.
How well do you know the basic units of measurement? Here's a ten question quiz covering both metric and English units that you can take to test yourself.
Why Is lb the Symbol for Pounds?
Have you ever wondered why lb is used as the symbol for the pounds unit? Here's the answer to the question.
Have you ever wondered why lb is used as the symbol for the pounds unit? Here's the answer to the question.