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CISCE(English Medium) ICSE Class 9
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पाठ्यक्रम

Gas Laws

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Topics

  • Definition: Gas Equation
  • Definition: Absolute Scale or Klevin Scale
  • Law: Boyle's Law
  • Law: Charle's Law
CISCE: Class 10

Definition: Gas Equation

The volume of a given mass of a dry gas varies inversely as the pressure and directly as the absolute temperature.

V ∝ \[\frac {1}{P}\] × T or \[\frac {PV}{T}\] = k (constant)

If volume changes from V1​ to V2​, pressure from P1​ to P2​, and temperature from T1 to T2​, then:

\[\frac {P_1V_1}{T_1}\] = \[\frac {P_2V_2}{T_2}\] = k (constant)

CISCE: Class 10

Definition: Absolute Scale or Kelvin Scale

A temperature scale with absolute zero (zero kelvin) as the starting point is called the absolute scale or the kelvin scale.

CISCE: Class 10

Law: Boyle's Law

It states that the volume of a given mass of dry gas is inversely proportional to its pressure at a constant temperature.
P1V1 = P2V2 = k at constant temperature

CISCE: Class 10

Law: Charles's Law

It states that volume of a given mass of a dry gas is directly proportional to its absolute (kelvin) temperature, if the pressure is kept constant.

OR

The pressure remaining constant, the volume of a given mass of a dry gas increases or decreases by 1/273 of its volume for each 1°C increase or decrease in temperature respectively.

\[\frac {V_1}{T_1}\] = \[\frac {V_2}{T_2}\] = k at constant pressure

Related QuestionsVIEW ALL [61]

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The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called __________.

A small bubble rises from the bottom of a lake where the temperature and pressure are 6°C and 4 atm. to the water surface, where the temperature is 25°C and pressure is 1 atm. Calculate the final volume in (mL) of the bubble, if its initial volume is 1.5 mL.

Give reason for the following:

Gases have a lower density compared to solids or liquids.

Consider a sample of a gas in a cylinder with a movable piston.

Show diagrammatically the changes in the position of the piston, if the temperature is decreased from 300 K to 150 K at constant pressure.

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Column ‘A’ Column ‘B’
a. Boyle’s law i. at constant pressure and volume
b. Charles’ law ii. at constant temperature
  iii. at constant pressure
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