# Chemistry Unit 3:2

## 15 terms

### International System of Units (SI)

scientists use this metric based system

### meter

The basic SI unit of length

### liter

Basic unit of volume in the metric system

### weight

the force exerted by a mass as a result of gravity

1000 grams

### gram

a metric unit of weight

### temperature

a measure of how hot or cold something is

### Celsius

a temperature scale that defines the freezing point of water as 0 degrees and the boiling point of water as 100 degrees

### Kelvin

SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.

### absolute zero

The coldest temperature, 0 Kelvin, that can be reached. It is the hypothetical temperature at which all molecular motion stops.

### energy

the ability to do work

### joule

si unit of energy

### calorie

unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure

mass/volume

### Conversion factor

a ratio derived from the equality between two different units that can be used to convert from one unit to the other