Question

Which of the following holds a correct relation between pressure, temperature and altitude?

(a) Pressure increases, temperature decreases, altitude increases

(b) Pressure decreases, temperature decreases, altitude increases

(c) Pressure decreases, temperature increases, altitude increases

(d) Pressure decreases, temperature decreases, altitude decreases

The question was posed to me in an interview for internship.

My question is taken from Characteristics of Atmosphere topic in division Atmosphere and Air Data Measurement of Aircraft Performance

Answer 1

Right option is (b) Pressure decreases, temperature decreases, altitude increases

For explanation I would say: As the pressure decreases there will be a temperature decreases during an increase in altitude. This is based on ideal gas equation PV=nRT where,

P=pressure of gas (Units=N/m^2)

V=volume of gas (Units=m^3)

ρ=density of gas (Units=Kg/m^3)

R=universal gas constant (Units=Nm/kg-K)

T=temperature of gas (Units=K).