Physical Units and Quantities

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Physical Units and Quantities by Mind Map: Physical Units and Quantities

1. Physical Quantities and their SI units

1.1. Length

1.1.1. metre (m)

1.1.1.1. length of the path travelled by light in a vacuum during a time interval of 1/299792458 of a second

1.2. Electric Current

1.2.1. amphere (A)

1.3. Mass

1.3.1. kilogram (kg)

1.3.1.1. mass of a certain cylindrical piece of platinum-iridium alloy kept at the International Bureau of Weights and Measures at Sèvres, France

1.4. Thermodynamic Temperature

1.4.1. kelvin (K)

1.5. Time

1.5.1. second (s)

1.5.1.1. 9192631700 times the period of oscillation of radiation from the cesium atom

1.6. Luminous Intensity

1.6.1. candela (Cd)

1.7. Amount of Substance

1.7.1. mole (mol)

2. Prefixes in Units and their values

2.1. tera (T)

2.1.1. 10 to the power of 12

2.2. giga (G)

2.2.1. 10 to the power of 9

2.3. mega (M)

2.3.1. 10 to the power of 6

2.4. kilo (k)

2.4.1. 10 to the power of 3

2.5. hecto (h)

2.5.1. 10 to the power of 2

2.6. deka (da)

2.6.1. 10 to the power of 1

2.7. deci (d)

2.7.1. 10 to the power of -1

2.8. centi (c)

2.8.1. 10 to the power of -2

2.9. milli (m)

2.9.1. 10 to the power of -3

2.10. micro (µ)

2.10.1. 10 to the power of -6

2.11. nano (n)

2.11.1. 10 to the power of -9

2.12. pico (p)

2.12.1. 10 to the power of -12

2.13. femto (f)

2.13.1. 10 to the power of -15

3. Measuring Length

3.1. Metre Rule

3.1.1. max: 1000m

3.1.2. accuracy: 0.001m/ 1mm

3.1.3. same accuracy as measuring tape

3.2. Vernier Calipers

3.2.1. accuracy: ±0.01cm/ ±0.1mm

3.3. Micrometer Screw Gauge

3.3.1. accuracy: ±0.001cm/ ±0.01mm

4. Measuring Mass

4.1. Electronic Beam Balance

4.2. Beam Balance

4.3. Sliding Balance

5. Measuring Time

5.1. clock

5.2. digital stopwatch

5.3. analogue stopwatch

5.4. watches

5.5. ticker-tape timers