How can we help?

You can also find more resources in our Help Center.

scientific notation

way of expressing a number as the product of a number between 1 and 10 and a power of 10

length

straight line distance between 2 points; measured in meters

mass

the quantity of matter in an object; base unit is kg

volume

amount of space taken up by an object; measured in liters or cubic meters

density

ratio of an object's mass to its volume

precision

a gauge of how exact a measurement is

significant figures

all known digits in a measurement plus one estimated digit

accuracy

closeness of a measurement to the actual value of what is being measured

thermometer

instrument that measures temperature

SI

set of measuring units used by scientists