Aim a) To verify that the pressure of a gas varies linearly with its temperature (expressed in degrees Celsius) when the volume of the gas is kept constant. b) To make an estimate in degree Celsius of absolute zero.

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﻿Pressure Law and Absolute Zero

Aim

a) To verify that the pressure of a gas varies linearly with its temperature (expressed in degrees Celsius) when the volume of the gas is kept constant.

b) To make an estimate in degree Celsius of absolute zero (i.e. zero Kelvin)

Background Knowledge

Pressure is the amount of force acting per unit area[1].It is exerted by particles collisions inside a closed container.

Temperature is an objective measure of cold or hot.

When a gas is heated, the particles moving speed increase due to the increase kinetic energy.It means the particles hit the side of the container more frequently and create a greater force on it. As more force on the area,the pressure increase.

According to the Pressure law,for constant volume and mass of a gas,the pressure exerted on the side of the container is directly proportional to the absolute temperature(in Kelvin) of the gas.Thus, the temperature would reach absolute zero as pressure become zero.

We can determine absolute zero by extrapolating the pressure vs. temperature graph to zero pressure.

Variable

Variable

Method of measuring

Independent Variable

Temperature

We determine the temperature of the gas by measuring the temperature of the water.

Dependent Variable

Pressure

Pressure will be measure by the pressure gauge.

Control Variable

Volume

The gas was in the closed glass bulb, the volume is constant.

Equipment

Pressure gauge

Glass bulb

tripod

beaker

Some ice

Bunsen burner

stand and clamp
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