Altrimetry

Question 1

What is altimetry?

Answer 1

The study of pressure variation within the atmosphere.

Question 2

As height increases pressure and density….

Answer 2

Decrease

Question 3

What 3 factors effect density?

Answer 3

1) pressure: greater the pressure the greater the density
2) humidity: water vapour is less dense than dry air.
3) Temperature: the lower the temperature the greater the density

Question 4

What is pressure?

Answer 4

Force per unit area

Question 5

What is a dyne?

Answer 5

Force required to produce acceleration of 1cm per second per second to a mass of 1kg

Question 6

What is a hectopascal?

Answer 6

1,000 dynes per square cm

Question 7

What is the ISA pressure in inches of mercury ?

Answer 7

29.92 inches

Question 8

What is the ISA?

Answer 8

The standard atmosphere is a set of average values which are utilises for calibration.

Question 9

List the ISA

Answer 9

MSL Temperature 15
MSL pressure 1013.25 hPa(29.92 inches)
MSL Density 1225gm Cu m
Lapse Rate 1.98 per 1,000ft (up to 11kms/36,090ft)