Lecture 7

Question 1

Ideal gas

Answer 1

A gas that obeys the ideal gas law which is a mathematical relationship that governs the gas so-called ‘state variables’

• temperature
• pressure
• density

Question 2

temperature

Answer 2

Measure of the amount of internal energy(or heat) a substance contains.
-Average kinetic energy contained in the molecules of a given substance

Question 3

Pressure

Answer 3

The average force per unit area exerted by the continuous collision of molecules moving about randomly in a gas.

Question 4

Units of pressure

Answer 4

newtons/m^2
Pascal- N/m^2
Bar- 10^5 N/m^2
1 millibar-hecto-pascal-10^2 N/m^2
Atmoshpere-1 Atm- 1013mb

Question 5

Density

Answer 5

Measure of the mass of material per unit volume

Question 6

Boyle’s Law

Answer 6

pV=constant, if T is constant

Question 7

Charles’s Law

Answer 7

V/T=constant, if p is constant

Question 8

Dalton’s Law

Answer 8

ptot=p1+p2+p3… where ptot is the total p of a mixture and pi is the partial pressure

Question 9

Ideal Gas Law

Answer 9

Combination of Boyle’s and Charles’ Law, pV/T=c or p =cT/V

Question 10

Equation of state of dry air

Answer 10

P=pRT, where R is the universal gas constant

Question 11

Hydrostatic Balance

Answer 11

Balance between pressure and gravity that supports the atmosphere.

Question 12

Barometric Law

Answer 12

Mathematical statement of the hydrostatic balance. The rate at which p must decrease with z to maintain hydrostatic balance.