Temperature Terminology & stuff

Question 1

High specific heat capacity

Answer 1

Holds heat in. Takes long time to heat & long time to cool.
E.g. water

Question 2

Inversion

Answer 2

Increase in temperature, higher up you go.

Question 3

Isothermal layer.

Answer 3

Constant temperature layer. Altitude altitude, but same temperature.
E.g tropopause

Question 4

Thermal inertia

Answer 4

Speed at which an object takes to change its temperature in accordance to that of its surroundings.

HOW LONG DOES IT RESIST.

Water has high thermal inertia.

Question 5

Atmospheric pressure is (as described by oana) “the force… ?”

Answer 5

The force of the mass of the gas above

Question 6

Temperature & water vapour.
Colder temp=
Warmer temp=

Answer 6

Less water vapour

More water vapour

Question 7

Mid latitude degrees:

Answer 7

30⚫️ to 60⚫️ latitude in both hemispheres

Question 8

Ozone O3

Answer 8

Above 30km

Absorbs short wave UV

Question 9

Jet streams come from where there’s

Answer 9

Folds / breaks in tropopause

Question 10

Density lapse rate
MSL:
75%:
50%:
25%:

Answer 10

1.225kgm^3
10,000
22,000
40,000

Question 11

Actual pressure lapse rate

Answer 11

H =96T/P

Height change in ft per hPa

Question 12

ISA pressure lapse rate

Answer 12

1 hPa per 27ft up to 18,000
Then
1 hPa per 50ft from 18,000ft +

Question 13

What’s used to measure upper air temperature?

& surface air temperature?

Answer 13

A radiosonde (balloon thing).
A Stevenson screen, at 1.2m above ground

Question 14

Convection. Rising air creates up currents called:

Answer 14

Thermals

Question 15

Diurnal

Answer 15

Variation of surface temperature between day & night

Question 16

Two ways to measure pressure?

Answer 16

Barometer => mercury up a tube

Simple aneroid barometer ‘aneroid wafers’

Question 17

Altimeter is set at…

Answer 17

ISA pressure

Question 18

Isobars

Answer 18

Areas where pressure is the same. The weird kinda circular shapes on a contour chart.

Question 19

Pressure gradient force

PGF

Answer 19

Difference between each isohype.

Strong PGF = highwinds.

Question 20

Static pressure is

Answer 20

Pressure caused by effect of gravity on mass of air

Question 21

Dynamic pressure

Answer 21

Kinetic energy per unit volume

Question 22

Warm air to cold air =

Answer 22

NOT GOOD.

NEARER TO GROUND.

Question 23

Isohype

Answer 23

The lines of the isobars (the weird kinda circular shape things). Found on a contour chart.

Question 24

Outside Pressure reading for altimeter enters through the

Answer 24

Static port.

Question 25

QFE

Answer 25

pressure measured at airfield

Question 26

QNH

Answer 26

Pressure calculated using ISA lapse rate

Question 27

QFF

Answer 27

Pressure calculated using actual pressure lapse rate

Question 28

SPS (standard pressure setting)

Answer 28

1013 hPa

Question 29

Regional pressure settings (RPS)

Answer 29

Average QNH across large area.

Question 30

True altitude

Answer 30

Legitimate a/c altitude above sea level In formula: Pressure correction - temperature correction

Question 31

Indicated altitude

Answer 31

Whatever altitude you’ve got on your altimeter

Question 32

Pressure correction formula

Answer 32

TA=IA +27 (Pressure datum - subscale) QFE, QNH, QFF. the pressure You’ve put in Dial on altimeter

Question 33

Thickness | T

Answer 33

Height between airport to aircraft indicative altitude / 1000 (Indicative altitude might height from MSL. So bear in mind what elevation the airport is on. As will need to take the airport elevation away fro, indicated altitude.)

Question 34

Temperature correction

Answer 34

4 x T x ISA dev

Question 35

Bernoulli effect=

Answer 35

Increased air flow = reduction in static pressure.