# A lightbulb contains Ar gas at a temperature of 295K and at a pressure of 75kPa. The light bulb is switched on, and after 30 minutes its temperature is 418 K. What is a numerical setup for calculating the pressure of the gas inside the light bulb at 418K?

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Assume the volume of the light bulb remains constant.

Assume the volume of the light bulb remains constant.

##### 1 Answer

May 9, 2017

#### Answer:

The assumption is quite reasonable.........

#### Explanation:

And so

Had the light bulb been sealed at normal pressure during its manufacture, what do you think might occur when it is operated?