Change of Volume of a Gas

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Change of Volume of a Gas

Planning-

Aim

* Determine how the volume of a gas changes with the temperature for

a fixed amount of gas and pressure.

* Determine absolute zero

Hypothesis

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Volume is directly proportional to Temperature

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Preliminary Test

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A preliminary experiment wsa carried out to test our apparatus. In

this test we used an alcohol thermometer to see if there was any

change in volume as the capillary tube was heated. Our results

suggested that an increase in temperature resulted in an increase of

volume of the air bubble.

Background research

When a substance is given energy the particles in it are given more

kinetic energy

I the case of a gas, the particles will move around at higher speeds.

Hot air balloons were extremely popular at that time and scientists

were eager to improve the performance of their balloons. Two of the

prominent French scientists, Jacques Charles and Joseph-Louis

Gay-Lussac, made detailed measurements on how the volume of a gas was

affected by the temperature of the gas. Given the interest in hot air

balloon at that time, it's not surprising these men should be

interested in the temperature-volume relationship for a gas.

The conclusion of this experiment is expressed in Charles' Law, stated

as follows.

The volume of a fixed mass of gas at constant pressure is directly

proportional to the absolute temperature.

The absolute zero of temperature has not been attained in practice; it

is a theoretical prediction found by extrapolation of experimental

resul...

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(i) Average air pressure,

(ii) Average Humidity

(iii)Average air temperature 20degrees centigrade

(iv) Situated on a wooden table

These should cause the

(3) I will disregard any anomalous results.

(4) I will make sure that all measurements are made accurately by

using a millimetre ruler

To make the results more reliable I will repeat each variable three

times and then take an average to form my results

Predictions

My predictions are based on the findings from the experiments carried

out by Charles

I predict that there will be a direct relationship between the volume

of the air bubble and the temperature. In quantities terms, terms I

think that the volume will increase directly proportionally to the

temperature (e.g. by doubling the temperature it will also double the

volume).

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