A uniform capillary tube closed at one end contained dry air trapped by a thread of mecury 8.5 ×10^2
cm long. Calculate the pressure of the air in the tube
The pressure of the air in the tube can be calculated using the equation:
P = ρgh
where P is the pressure, ρ is the density of the air, g is the acceleration due to gravity, and h is the height of the mercury column.
Given that the height of the mercury column is 8.5 × 10^2 cm, the pressure of the air in the tube is:
P = (1.2 kg/m^3) (9.81 m/s^2) (8.5 × 10^2 cm/100 cm/m)
P = 10.2 kPa