1. SI System
Today we're going to begin our unit on measurement. In this unit, you are going to need a calculator.

2. Like biologists, chemists have their own "language."
SI System
Like biologists, chemists have their own "language."
Chemists measure the outcomes of their experiments in the International System of Units, or SI (French)

3. Base Units
In the SI system, scientists use 5 base measurements:
·Meter - Distance
·Kilogram - Weight
·Kelvin - Temperature
·Second - Time
·Mole - Amount

4. Prefixes
With the SI system, prefixes are of huge importance.
Common Prefixes
·Mega - 1 million times larger
·kilo times larger
·deci - 10 times smaller
·centi times smaller
·milli times smaller
·micro - 1 million times smaller
·nano million times smaller
·pico - 1 trilllion times smaller

5. Volume Volume can be tricky.
There are four units scientists use for volume:
·Liter - base unit, all others "based" off it
·Milliliter of these equals a liter
·Cubic cm - 1 cm3 equals 1 ml
·Microliter - 1 million of these equals a liter

6. There is a large difference between mass & weight.
Mass vs. Weight
There is a large difference between mass & weight.
·Mass is a measurement of the amount of matter something contains
·Weight is the measurement of the pull of gravity on an object.
·Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter.
·Weight is measured on a scale.
·The Mass of an object doesn't change when an object's location changes.
·Weight, on the otherhand does change with location.

7. Differences in Kelvin vs. Celsius
Temperature
Remember, hot = expansion, cold = contraction
Differences in Kelvin vs. Celsius
·Boiling points and freezing points of water
·Kelvin has absolute zero at 0 K - nothing known to be that cold
·To get from K to C, subtract 273 degrees
·To get from C to K, add 273 degrees

8. Energy
Energy is not something we're going to delve in to too deeply, we'll leave that for physics.
You should know the joule & calorie are the units.
1 calorie raises water temperature by 1 degree Celsius
1 J = .239 calories calorie = J