Section 1 - Gas physics

Question 1

What is Boyles Gas Law?

Answer 1

At Constant temperature, the absolute pressure of a given mass of an ideal gas is inversely proportional to the volume

Question 2

If you Double the Force of a Piston, what happens to the pressure and the volume of a gas in relation to Boyles gas law?

Answer 2

The Pressure will double, and the the volume will halve. The numerator in the consideration becomes the denominator of the volume consideration.

Question 3

What is meant by the term absolute pressure?

Answer 3

This is the pressure inclusive of Atmospheric pressure contributions. Where BarG is not. Ie 2 Bara is approx = to 1 BarG.

Question 4

What is the first condition of an ideal gas?

Answer 4

The Gas molecules must be small spheres, the volume of which are negligible in comparison to the volume that the gas occupies.

Question 5

What is the second condition of an ideal gas?

Answer 5

There are no attractive or repulsive intermolecular forces, and the behaviour of the molecules when colliding is similar to that of billiard balls. The collisions being elastic.

Question 6

What is the Mathematical expression of Boyles Law?

Answer 6

P1.V1 = P2.V2

Question 7

What is the expression of Charles Law?

Answer 7

Charles Law describes the relationship between the volume and temperature of an ideal gas, while the pressure is kept constant.

Question 8

What happens to the volume of a gas, at a fixed pressure, when heat is applied?

Answer 8

The volume increases linearly.

Question 9

What is Zero Kelvin?

Answer 9

This is absolute zero - -273.15 Degrees C

Question 10

What is freezing point of water in Kelvin scale?

Answer 10

273.15 Kelvin

Question 11

What is Boiling Point in Kelvin Scale?

Answer 11

373.15 Degrees

Question 12

What is Charles Law?

Answer 12

At constant pressure, the volume occupied by a given mass of gas is proportional to its absolute temperature.

Question 13

What is the mathematical formula of Charles gas law?

Answer 13

V1/T1 = V2/T2

Question 14

What is the combined Ideal Gas Law?

Answer 14

P1.V1/T1 = P2.V2/T2

Question 15

What is a.m.u of a Gas?

Answer 15

This is the Atomic Mass Unit.

Question 16

What does the symbol Mw signify?

Answer 16

Molecular Weight

Question 17

What is the Granme Mole? (g-mol)

Answer 17

This is the atomic or molecular mass of a substance expressed in grammes.

Question 18

What is the relationship between Moles, mass and molecular weight?

Answer 18

n = m/Mw

Where;

n= number of miles
m = mass (in KG) 
Mw = Molecular weight in a.m.u

Question 19

What is the calculation for Molecular weight?

Answer 19

Mw = m(kg)/n (kg-mol)

Question 20

What are Mole-Fractions?

Answer 20

This is a measure of quantities of constituent gases in a mixture. Eg 80% Methane = 80parts per 100. Etc.

Question 21

How is a mixture Mol mass calculated?

Answer 21

Determine the molecular mass of constituents gases and factor by the mole-fraction of the mixture. Add the results.

Question 22

What is the value of (R), the universal gas constant, when pressure is Bar, volume is M3, temperature is K, n is Kg-mol?

Answer 22

R = 0.0831

Question 23

What is the Combined gas law in light of ideal gas constants?

Answer 23

PV=nRT

Where;

P= Pressure
V= Volume
n= Number of moles
R= Universal Gas Constant (0.0831)
T = Temperature in Kelvin (K).

Question 24

What is the definition of Standard Pressure and Temperature?

Answer 24

1.013 Bar; 15 Degrees c

Question 25

What is Normal Pressure and Temperature defined as?

Answer 25

1.013 Bar; 0 Degrees C.

Question 26

What is STP in imperial units?

Answer 26

14.73 psia; 60 F

Question 27

What is meant by a standard cubic metre of gas?

Answer 27

A standard cubic metre is the quantity of gas that has a volume of 1m3 at 15 Degrees C and 1.013 Bar.

Question 28

What is meant by Actual volume?

Answer 28

This is conditions at the actual temperature and pressure present. These values need to be converted to standard

Question 29

What type of activities require accurate gas flow measurement?

Answer 29

``` Oil Field Evaluation Process Control and Optimisation Gas Sales Contracts Hydrocarbon Taxation Fiscal Standards ```

Question 30

What is the combined ideal gas gas equation when factoring for the compressibility factor of the Gas?

Answer 30

PV=ZnRT Where; Z = Compressibility factor