# Calculate volume of void in a thermometer

I am struggling to find a ground for this question

So I have a mercury thermometer. There's a $$0.2\, \mathrm{cm^3}$$ void in the glass. The question asks for the new volume of void after a change in temperature.

Below are the known quantities $$\Delta T \\ \beta_{\text{mercury}} \\ \beta_{\text{glass}}$$

Normally, if the initial volume of two materials are given, I can calculate the difference between their volume changes $$\Delta V$$. However, this question did not provide the initial volume of mercury and glass.

The best I can do for this question, is to express the final answer in some unknown variable $$x$$

• Where did you get the (0.2)? Sep 13, 2021 at 13:35
• @R.W.Bird It's 0.2, I made a mistake and said 0.5 at the beginning, edited my post Sep 13, 2021 at 23:30