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A glass of hot water is covered with an airtight lid and left to cool. Why is it difficult to lift the lid when the water is cold.
When a gas is compressed in a container (assume that the temperature remain unchanged), the pressure of the gas increases owing to
The air pressure in a tyre is 240 kPa at a temperature of 20°C. Find the pressure of the air when the temperature increases to 50°C. (Give your answer correct to 3 significant figure)
Figure (a) above shows some air is trapped in a capillary tube by a mercury column of 5cm. Figure (b) shows the condition when the capillary tube is hold horizontal. Find the length, h, of the air trapped in (b). (Atmospheric pressure = 75cmHg)
Figure (a) above shows some air is trapped in a capillary tube by a mercury column of 5cm. Figure (b) shows the condition when the capillary tube is hold horizontal. Find the length, h, of the air trapped in (b). (Atmospheric pressure = 75cmHg)