1. Mass
1.1. SI Unit
1.1.1. Kilogram
1.1.1.1. Symbol: kg
1.2. definition
1.2.1. The quantity of matter it contains
1.3. Instruments
1.3.1. Electronic Beam Balance
1.3.1.1. precision
1.3.1.1.1. 0.1g
2. Time
2.1. SI Unit
2.1.1. Second
2.1.1.1. Symbol: s
2.2. Definition
2.2.1. 9192631700 times the period of oscillation of radiation from the cesium atom
2.3. Instruments
2.3.1. Digital Stopwatch
2.3.1.1. precision
2.3.1.1.1. 0.01s
2.3.1.2. Note: human reaction error ( about 0.3s)
2.3.2. Pendulum
2.3.2.1. String attached to a bob
2.3.2.2. repetitive motion
2.3.2.2.1. Oscillation
3. Length
3.1. Instruments
3.1.1. Micrometer Screw Gauge
3.1.1.1. www.youtube.com.sg/watch?v=4Buq4Zwi1Q0
3.1.1.2. precision
3.1.1.2.1. 0.001 cm
3.1.2. Metre Rule
3.1.2.1. precision
3.1.2.1.1. 0.001m
3.1.2.2. most common
3.1.3. Vernier Caliper
3.1.3.1. precision
3.1.3.1.1. 0.01cm
3.1.3.2. uses
3.1.3.2.1. diameter
3.1.3.2.2. depth
3.2. Definition
3.2.1. Length of the path traveled by light in a vacuum during a time interval of 1/299792458
3.3. SI Unit
3.3.1. metre
3.3.1.1. symbol: m