Air is trapped in the sealed lower end of a capillary tube by a mercury column as

Question:

Air is trapped in the sealed lower end of a capillary tube by a mercury column as shown in Fig. 16-1. The top of the tube is open. The temperature is 14 °C, and atmospheric pressure is 740 mmHg. What length would the trapped air column have if the temperature were 30 °C and atmospheric pressure were 760 mmHg? 8.0 cm 12 cm Fig. 16-1