Physical Quantities and Units

1. Prefixes

1.1. tera = T = 10^12

1.2. giga = G = 10^9

1.3. mega = M = 10^6

1.4. kilo = k = 10^3

1.5. hecto = h =10^2

1.6. deka = da = 10^1

1.7. deci = d =10^-1

1.8. centi = c =10^-2

1.9. milli = m = 10^-3

1.10. micro = (i cant find the unit) = 10^-6

1.11. nano = n = 10^-9

1.12. pico = p = 10^-12

1.13. femto = f = 10^-15

2. Length(m).

2.1. The Metre Rule

2.1.1. Precision = 1 mm/ 0.1 cm

2.2. The Vernier Calipers

2.2.1. Precision = 0.1 mm/ 0.01 cm

2.3. Micrometre Screw Gauge

2.3.1. Precision = 0.01 mm/ 0.001 cm

3. Mass(kg)

3.1. Mass is different from weight

3.2. Measured with electronic beam balance

3.2.1. Precision = 0.1 g

4. Time(s)

4.1. Measured with a digital stopwatch

4.1.1. Precision = 0.01 s