Air & Gases

Question 0

Mixing ratio = …………./……….

Answer 0

Number of atoms or molecules in gas / total number of all atoms and molecules of all gases present

Question 1

The mixing ratio is the ratio of…..

Answer 1

One substance to the quantity of all substances present in a sample.

Question 2

The earths atmosphere is held above the surface, defying gravity by

Answer 2

The continual energy input of the sun

Question 3

Water acts as an

Answer 3

Energy store in the atmosphere.

Question 4

Water captures energy as

Answer 4

Radiation and stores and transports energy.

Question 5

Water vapour is a

Answer 5

Greenhouse gas

Question 6

Ozone absorbs

Answer 6

Uv radiation

Question 7

Ozone ground mixing ratio is

Answer 7

5 - 30 ppbv

Question 8

Ozone altitude mixing ratio is

Answer 8

6000 - 8000 ppbv

6 - 8 ppmv

Question 9

CO2 absorbs

Answer 9

IR, preventing it from escaping into space - it is a GHG.

Question 10

CO2 is responsible for natural

Answer 10

Acid rain

Question 11

Aerosols absorb radiation and scatter light, they are

Answer 11

Clumps of many different atoms and molecules, such as dust particles.

Question 12

Air is 78% nitrogen,

Answer 12

21% oxygen and 1% trace gases - water, co2, ozone.

Question 13

Number density N/V is the

Answer 13

Number of particles per unit volume

Question 14

Mass density is the

Answer 14

Mass per unit volume

Question 15

Mass density equation

Answer 15

P = m/v

Question 16

The perfect gas law equation

Answer 16

P = N/V k T

Question 17

P = N/V k T - units…

Answer 17

P - pressure - Pa
N/V - number density - m ^3
k - Baltzman constant - 1.38 x 10 ^-23 J K ^-1
T - temp - K

Question 18

The perfect gas law relates

Answer 18

Pressure, density and temperature

Question 19

The SI unit for pressure is

Answer 19

Pascals - Pa

Question 20

Pressure is proportional to number density (P=N/V), therefore

Answer 20

If the number of particles in the gas is doubled, so is the pressure.

Question 21

1 bar = 10 ^5 Pa

Answer 21

1mbar = 10^-3 bar = 100 Pa = 1 hPa

Question 22

Pressure is a measure of the

Answer 22

Push of gas

Question 23

If an area is halved, the force remains the same,

Answer 23

But the pressure is doubled.

Question 24

0 K = ‘C +

Answer 24

+ 273.15

Question 25

Nothing is lower than

Answer 25

0 K

Question 26

Force is the product of mass x acceleration

Answer 26

F = ma

Question 27

Pressure is defined as

Answer 27

Force per unit area

P = F/A

Question 28

F = ma - units

Answer 28

Mass - kg

Acceleration - m s ^-2

Question 29

If forces are not balanced, the acceleration from high to low pressure occurs, this

Answer 29

Creates a flow of air - wind

Question 30

For every force there is an

Answer 30

Equal and opposing force

Question 31

If force is applied, the an object changes speed that is

Answer 31

Directly proportional to F

a = F/m

Question 32

The SI unit of force is

Answer 32

Newton (N)

Question 33

1 Newton =

Answer 33

1 kg m s ^-2

Question 34

1 pa =

Answer 34

1 N m^-2

Question 35

To obey the perfect gas law, if T rises and p cannot change then,

Answer 35

N/V must decrease.

Question 36

Mass -

Answer 36

M = pV

Question 37

1/2 mv^2 = mgh =

Answer 37

v = square root 2gh

Question 38

The perfect gas law tells us that

Answer 38

Temp, number density and pressure are all directly proportional to one another.

Question 39

Convert mass to N/V by

Answer 39

N/V = mass density /mass of typical air particle.

Question 40

J m^-3 =

Answer 40

1 Pa

Question 41

Stefan Boltzmann law:

Answer 41

R = A σ Τ^4

R - rate of energy emitted.
A - surface area.
σ - Stefans constant 5.67 x 10-8 W m-2 K-4