Air & Gases Flashcards

0
Q

Mixing ratio = …………./……….

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

The mixing ratio is the ratio of…..

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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

A

The continual energy input of the sun

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Water acts as an

A

Energy store in the atmosphere.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Water captures energy as

A

Radiation and stores and transports energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Water vapour is a

A

Greenhouse gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Ozone absorbs

A

Uv radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Ozone ground mixing ratio is

A

5 - 30 ppbv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Ozone altitude mixing ratio is

A

6000 - 8000 ppbv

6 - 8 ppmv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

CO2 absorbs

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

CO2 is responsible for natural

A

Acid rain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Aerosols absorb radiation and scatter light, they are

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Air is 78% nitrogen,

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Number density N/V is the

A

Number of particles per unit volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Mass density is the

A

Mass per unit volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Mass density equation

A

P = m/v

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The perfect gas law equation

A

P = N/V k T

17
Q

P = N/V k T - units…

A

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

18
Q

The perfect gas law relates

A

Pressure, density and temperature

19
Q

The SI unit for pressure is

A

Pascals - Pa

20
Q

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

A

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

21
Q

1 bar = 10 ^5 Pa

A

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

22
Q

Pressure is a measure of the

A

Push of gas

23
Q

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

A

But the pressure is doubled.

24
Q

0 K = ‘C +

A

+ 273.15

25
Q

Nothing is lower than

A

0 K

26
Q

Force is the product of mass x acceleration

A

F = ma

27
Q

Pressure is defined as

A

Force per unit area

P = F/A

28
Q

F = ma - units

A

Mass - kg

Acceleration - m s ^-2

29
Q

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

A

Creates a flow of air - wind

30
Q

For every force there is an

A

Equal and opposing force

31
Q

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

A

Directly proportional to F

a = F/m

32
Q

The SI unit of force is

A

Newton (N)

33
Q

1 Newton =

A

1 kg m s ^-2

34
Q

1 pa =

A

1 N m^-2

35
Q

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

A

N/V must decrease.

36
Q

Mass -

A

M = pV

37
Q

1/2 mv^2 = mgh =

A

v = square root 2gh

38
Q

The perfect gas law tells us that

A

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

39
Q

Convert mass to N/V by

A

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

40
Q

J m^-3 =

A

1 Pa

41
Q

Stefan Boltzmann law:

A

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