Does the volume of a fixed quantity of gas decrease to half its original value when the temperature is lowered from 100 ∘c to 50 ∘c ?

No

Explanation:

Let's assume the gas pressure is constant. Then we can use Charle's law, which states that the volume of the gas is proportional to the absolute temperature (in Kelvin):

This can be rewritten as

where we have

 is the initial temperature of the gas

 is the final temperature of the gas

Re-arranging the previous equation, we find

so, the volume of the gas decreases by a factor 0.87.

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ratio of distance traveled to time interval

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vector sum of forces on object

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source of diverging light rays either luminous or illuminated

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explanation: