# Measurement

Mind Map by Syifa, updated more than 1 year ago
 Created by Syifa about 6 years ago
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1

### Description

Measurement: Chapter 1

## Resource summary

Measurement
1 physical quantity
1.1 quantity that can be measured
1.2 numerical magnitude & a unit
1.2.1 SI units
1.2.1.1 prefixes
1.2.1.1.1 10^9 (G, giga-)
1.2.1.1.2 10^6 (M, mega-)
1.2.1.1.3 10^3 (k, kilo-)
1.2.1.1.4 10^-1 (d, deci-)
1.2.1.1.5 10^-2 (c, centi-)
1.2.1.1.6 10^-3 (m, milli-)
1.2.1.1.7 10^-6 (micro-)
1.2.1.1.8 10^-9 (n, nano-)
1.3 7 base quantities
1.3.1 #mass
1.3.1.1 kilogram (kg)
1.3.2 #time
1.3.2.1 second (s)
1.3.2.2 stopwatches
1.3.2.2.1 precision to 0.1s
1.3.2.3 pendulum
1.3.2.3.1 period
1.3.2.3.1.1 time taken for one complete oscillation
1.3.2.3.1.1.1 swing from one end to the other and back again to starting position
1.3.2.3.2 oscillation
1.3.2.3.2.1 each complete to-and-fro motion
1.3.2.4 human reaction time
1.3.3 #electric current
1.3.3.1 ampere (A)
1.3.4 #temperature
1.3.4.1 kelvin (K)
1.3.5 luminous intensity
1.3.5.1 candela (cd)
1.3.6 amount of substance
1.3.6.1 mole (mol)
1.3.7 #length
1.3.7.1 metre (m)
1.3.7.2 metre rule
1.3.7.2.1 avoid parallax errors
1.3.7.2.2 precision to 0.1cm; length of a book
1.3.7.3 vernier calipers
1.3.7.3.1 main scale & sliding vernier scale
1.3.7.3.2 check for zero error
1.3.7.3.2.1 positive/ negative
1.3.7.3.3.1 1. grip object gently using outside jaws of calipers
1.3.7.3.3.1.1 2. read main scale opp. zero mark on vernier scale
1.3.7.3.3.1.1.1 3. find the mark which coincides with a marking on main scale
1.3.7.3.4 precision to 0.01cm; diameter of a test-tube
1.3.7.4 micrometer screw gauge
1.3.7.4.1.1 1. turn thimble until the anvil and spindle gently grip the object, turn until ratchet clicks
1.3.7.4.1.1.1.1 3. thimble scale has 50 divisions, each is 0.01mm. take thimble reading opposite datum line of main scale
1.3.7.4.2 precision to 0.01mm; wires
1.3.7.4.3 check for zero error
1.3.7.4.3.1 positive/ negative
1.3.7.5 tape measure
1.3.7.5.1 precision to 0.1cm; a person's waist
1.4 derived quantities
1.4.1 area
1.4.1.1 length*width (m^2)
1.4.2 volume
1.4.2.1 length*width*height (m^3)
1.4.3 speed
1.4.3.1 length/time (ms^-1)

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