U1.1 Physical Quantitys Flashcards
1
Q
What is a measurement
A
A number multiplied by a unit
2
Q
What are the six base quantities
A
Length L
Mass m
Time t
Current I
Temperature T
Amount of substance n
3
Q
What are the six base units
A
Metre m
Kilogram Kg
Second s
Ampere A
Kelvin K
Mole mol.
4
Q
What is a Base unit
A
A unit from which all other units are derived
5
Q
What’s the difference between kelvin and Celsius
A
Kelvin starts at absolute zero (-273°C) which is the lowest possible temperature
Celsius starts at the freezing point of water (273 K)
6
Q
How do you change from Celsius to Kelvin
A
Add 273
7
Q
What is a derived quantity
A
A quantity made up of a combination of si base quantities
8
Q
What is a derived unit
A
A unit made up of two or more si base units
