Definitions

Question 1

Absolute humidity

Answer 1

Mass of water vapour present in a sample of air at a given temperature (kgm-3)

Question 2

Absolute zero

Answer 2

Lowest possible temp. where nothing could be colder and all thermal motion stops (0k)

Question 3

Boiling point

Answer 3

temperature at which vapour pressure equals the surrounding ambient pressure and changes into a vapour.

Question 4

SI units

Answer 4

SMMACKK

Seconds
Moles
metre
ampere
candela
kelvin
kilogram

Question 5

Second

Answer 5

The duration of a certain number of oscillations of a
caesium-133 atom

Question 6

Mole

Answer 6

The amount of substance that contains the same number of
particles as there are atoms in 0.012 kg (12 g) of carbon-12

Question 7

Metre

Answer 7

Length travelled by light in a vacuum in 1/300 000 000 of a
second

Question 8

Ampere

Answer 8

The current in two parallel conductors of infinite length,
placed 1 metre apart in a vacuum that would produce
force of 2x10-7 N/m

OR
1 coulomb per second

Question 9

Candela (cd)

Answer 9

Luminous intensity of monochromatic light

Question 10

Kelvin

Answer 10

1/273.16 of the thermodynamic triple point of water

Question 11

Kg

Answer 11

The mass of the prototype kilogram held in Sèvres, France, changed in 2019 to be defined by the planck constnat