1. Prefixes in Units and their values
1.1. tera (T)
1.1.1. 10 to the power of 12
1.2. giga (G)
1.2.1. 10 to the power of 9
1.3. mega (M)
1.3.1. 10 to the power of 6
1.4. kilo (k)
1.4.1. 10 to the power of 3
1.5. hecto (h)
1.5.1. 10 to the power of 2
1.6. deka (da)
1.6.1. 10 to the power of 1
1.7. deci (d)
1.7.1. 10 to the power of -1
1.8. centi (c)
1.8.1. 10 to the power of -2
1.9. milli (m)
1.9.1. 10 to the power of -3
1.10. micro (µ)
1.10.1. 10 to the power of -6
1.11. nano (n)
1.11.1. 10 to the power of -9
1.12. pico (p)
1.12.1. 10 to the power of -12
1.13. femto (f)
1.13.1. 10 to the power of -15
2. Measuring Time
2.1. clock
2.2. digital stopwatch
2.3. analogue stopwatch
2.4. watches
2.5. ticker-tape timers
3. Physical Quantities and their SI units
3.1. Length
3.1.1. metre (m)
3.1.1.1. length of the path travelled by light in a vacuum during a time interval of 1/299792458 of a second
3.2. Electric Current
3.2.1. amphere (A)
3.3. Mass
3.3.1. kilogram (kg)
3.3.1.1. mass of a certain cylindrical piece of platinum-iridium alloy kept at the International Bureau of Weights and Measures at Sèvres, France
3.4. Thermodynamic Temperature
3.4.1. kelvin (K)
3.5. Time
3.5.1. second (s)
3.5.1.1. 9192631700 times the period of oscillation of radiation from the cesium atom
3.6. Luminous Intensity
3.6.1. candela (Cd)
3.7. Amount of Substance
3.7.1. mole (mol)
4. Measuring Length
4.1. Metre Rule
4.1.1. max: 1000m
4.1.2. accuracy: 0.001m/ 1mm
4.1.3. same accuracy as measuring tape
4.2. Vernier Calipers
4.2.1. accuracy: ±0.01cm/ ±0.1mm
4.3. Micrometer Screw Gauge
4.3.1. accuracy: ±0.001cm/ ±0.01mm