1. Mass
1.1. Defination
1.1.1. quantity of matter it contains
1.2. SI unit
1.2.1. kilogram
1.3. Instruments
1.3.1. electronic beam balance
1.3.2. sliding balance
2. Length
2.1. Instruments
2.1.1. Metre rule
2.1.1.1. most common
2.1.1.2. maximum: 1 metre
2.1.1.3. minimum: 1 millimetre
2.1.2. Mesuring tape
2.1.2.1. same as metre rule
2.1.3. Vernier caliper
2.1.3.1. precision
2.1.3.1.1. +- 0.1 millimetre
2.1.3.2. inside jaws: interior diameter
2.1.3.3. outside jaws: exterior diameter
2.1.4. micrometer screw gauge
2.1.4.1. precision
2.1.4.1.1. +- 0.01 millimeter
2.1.4.2. http://www.youtube.com/watch?gl=SG&hl=en-GB&v=4Buq4Zwi1Q0
3. Prefixes in units
3.1. Tera: T: 10^12
3.2. Giga: G: 10^9
3.3. Mega: M: 10^6
3.4. Kilo: k: 10^3
3.5. Hecto: h: 10^2
3.6. Deka: da: 10^1
3.7. Deci: d: 10^-1
3.8. Centi: c: 10^-2
3.9. Milli: m: 10^-3
3.10. Micro: (cannot find unit): 10^-6
3.11. Nano: n:10^-9
3.12. Pico: p: 10^-12
3.13. Fento: f: 10^-15
4. Introduction
4.1. Unit
4.1.1. specified along the numerical value of quantity
4.1.2. physical quantity made relative to a particular standard
5. Time
5.1. Base unit
5.1.1. second
5.1.2. s SI unit
5.2. Instrument
5.2.1. digital stopwatch
5.2.2. analogue stopwatch
5.2.3. sundial
5.2.4. pendulum