1. Measurement in Safety in Physical Science
Scientific Units of Measurement

2. Hundreds of years ago scientists from different countries used different methods of measurement and therefore could not communicate.
England used 3 grains of barley to measure every inch, while the U.S. used a body part – a foot.

3. This was not accurate!! They developed a global measurement system known as International System of Units. It is known as SI instead of IS because the official name comes from a French system – Systeme International.

4. All SI units are based on the # 10 which makes conversion from one unit to the next very easy.
We use SI to measure length, volume, mass, and temperature.
Length - the distance from one point to another.

5. Prefixes:
Kilo = 1000
Mili = 1/1000
Centi = 1/100
Deci = 1/10
The prefix used depends on the size of object being measures.
Ex: measuring a long distance use kilometers
You measure length with a meter stick.