Gas laws
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Gas Laws. We will cover. Boyle's Law Dalton's Law Henry's Law Charles' Law. Boyle’s Law. “At a constant temperature, the volume of a given mass of gas varies inversely with the absolute pressure”. Dalton's Law.

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Gas laws

Gas Laws


We will cover

We will cover

  • Boyle's Law

  • Dalton's Law

  • Henry's Law

  • Charles' Law


Boyle s law

Boyle’s Law

“At a constant temperature, the volume of a given mass of gas varies inversely with the absolute pressure”


Dalton s law

Dalton's Law

“In a mixture of gases, each constituent gas exerts a Partial Pressure in proportion to its percentage of the mixture”


Dalton s law example

Dalton's Law(Example)

  • Pure air at 1 bar pressure

  • Air consists 79% nitrogen and 21% oxygen

  • Partial pressure of nitrogen = 0.79 bar (ppN2 = 0.79 bar)

  • Partial pressure of oxygen= 0.21 bar (ppO2 = 0.21 bar)


Henry s law

Henry's Law

"The amount of gas that dissolves in a liquid is proportional to the partial pressure of the gas in contact with the liquid"

(Providing temperature is constant)


Henry s law1

Henry's Law

Cap sealed

High

pressure

Excess

gas

dissolved

in liquid


Henry s law2

Gas Bubbling

rushing out

of liquid

Henry's Law

Cap removed

Reduced

pressure

Reduced amount

of gas

can dissolve

in liquid


Charles law

Charles' Law

"At constant pressure the volume of a gas varies directly with the absolute temperature"

or

"At constant volume the pressure of a gas varies directly with the absolute temperature"


Charles law example

Charles' Law(Example)

  • Cylinder pressure = 232 Bar (P1)

  • Original temperature = (20°C) 293 K (T1)

  • Temperature increase to (70°C) 343 K (T2)


Charles law example1

P1

P2

=

T1

T2

P2 = P1 x T2

T1

P2 = 232 x (273 + 70)

(273 + 20)

Charles' Law(Example)

  • If

  • New pressure in cylinder = 271 Bar

= 271 Bar


Gas laws summary

Gas Laws Summary

  • Boyle's Law

    • Relates pressure and volume

  • Dalton's Law

    • Defines partial pressure exerted by individual gases in a mixture of gases

  • Henry's Law

    • Defines the solubility of gases in a liquid

  • Charles' Law

    • Relates change in pressure and volume of gases to changes in temperature


Questions

Questions


Pressure and volume are inter related by

Pressure and volume are inter-related by:

  • Charles' Law?

  • Boyle's Law?

  • Henry's Law?


Pressure and volume are inter related by1

Pressure and volume are inter-related by:

  • Charles' Law?

  • Boyle's Law?

  • Henry's Law?


Dalton s law deals with

Dalton's Law deals with:

  • Pressure changes due to temperature increases?

  • Volume changes due to temperature increases?

  • Partial pressures of gases?


Dalton s law deals with1

Dalton's Law deals with:

  • Pressure changes due to temperature increases?

  • Volume changes due to temperature increases?

  • Partial pressures of gases?


The gas law used to explain the bends is

The Gas Law used to explain the Bends is:

  • Charles'?

  • Dalton's?

  • Henry's?


The gas law used to explain the bends is1

The Gas Law used to explain the Bends is:

  • Charles'?

  • Dalton's?

  • Henry's?


Gas laws

At a depth of 20 metres in sea water the partial pressure of nitrogen in the air supply will be _____ times the partial pressure which it is at the surface:

  • Two?

  • Three?

  • Four?


Gas laws

At a depth of 20 metres in sea water the partial pressure of nitrogen in the air supply will be _____ times the partial pressure which it is at the surface:

  • Two?

  • Three?

  • Four?


Exposing a full diving cylinder to excessive heat is not recommended because

Exposing a full diving cylinder to excessive heat is not recommended because:

  • The paint may deteriorate and allow rust?

  • The rubber seals involved may perish and give rise to air leaks?

  • The internal air pressure may rise excessively?


Exposing a full diving cylinder to excessive heat is not recommended because1

Exposing a full diving cylinder to excessive heat is not recommended because:

  • The paint may deteriorate and allow rust?

  • The rubber seals involved may perish and give rise to air leaks?

  • The internal air pressure may rise excessively?


Serious diving ailments such as nitrogen narcosis are explained using

Serious diving ailments such as Nitrogen Narcosis are explained using:

  • Boyle's Law?

  • Charles' Law?

  • Dalton's Law?


Serious diving ailments such as nitrogen narcosis are explained using1

Serious diving ailments such as Nitrogen Narcosis are explained using:

  • Boyle's Law?

  • Charles' Law?

  • Dalton's Law?


The analogy of the bubbles forming in a fizzy drink when the bottle is opened is used to explain

The analogy of the bubbles forming in a fizzy drink when the bottle is opened is used to explain:

  • The Bends?

  • Oxygen Starvation?

  • Nitrogen Narcosis?


The analogy of the bubbles forming in a fizzy drink when the bottle is opened is used to explain1

The analogy of the bubbles forming in a fizzy drink when the bottle is opened is used to explain:

  • The Bends?

  • Oxygen Starvation?

  • Nitrogen Narcosis?


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