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# The length of mercury thread when it is at 0oC, 100oC and at an unknown temperat...

### Question

The length of mercury thread when it is at 0oC, 100oC and at an unknown temperature $$\theta$$ is 25mm, 225mm and 175mm respectively. The value of $$\theta$$ is

### Options

A) 85.0oC

B) 80.0oC

C) 75.0oC

D) 70.0oC

The correct answer is C.

### Explanation:

$$\frac{\theta\ - 0}{100 - 0}$$ = $$\frac{175 - 25}{225-25}$$

$$\theta$$ = 75.0oC

## Dicussion (1)

• $$\frac{\theta\ - 0}{100 - 0}$$ = $$\frac{175 - 25}{225-25}$$

$$\theta$$ = 75.0oC

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