# Chapter 3

## 25 terms · Vocab

### measurement

a quantity that has both a number and a unit

### scientific notation

a given number is written as a product of two numbers: a coefficient and 10 raised to a power

### accuracy

a measure of how close a measurement comes to the actual or true value of whatever is measured

### precision

a measure of how close a series of measurements are to one another

### accepted value

the correct value based on reliable references

### experimental value

the value measured in the lab

### error

the difference between between the experimental value and the accepted value

### percent error

the absolute the value of the error divided the accepted value multiplied by 100%

### significant figures

in a measurement include all digits that are known plus the last digit that is estimated

### International System of Units (SI)

a revised version of the metric system

### joule (J)

the SI unit of energy

### meter (m)

the basic unit of length

### liter (L)

the basic unit volume

### kilogram (kg)

the basic unit of mass

### gram (g)

a metric mass unit equivalent to the mass 1cm cubed of water at 4˚C

### weight

a force that measures the pull on a given mass by gravity

### temperature

a measure of how hot or cold an object is

### Celsius scale

sets the boiling point of water at 100˚C and the freezing point of water at 0˚C

### Kelvin scale

the temperature scale in which the freezing point of water is 273 K and the boiling point is 373 K

### absolute zero

the zero point on the Kelvin temperature scale equivalent to -273.15˚C; 0 K

### conversion factor

a ratio of equivalent measurements

### dimensional analysis

a way to analyze and solve problems using the units, or dimensions, of the measurements

### density

the ratio of the mass of an object to it volume

### energy

the capacity to do work or to produce heat

### calorie (cal)

the quantity of heat that raises the temperature of 1g of pure water by 1˚C