a) b) When jam is made, it is put into the jam jar and the top...

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a) b) When jam is made, it is put into the jam jar and the top screwed down whilst the jam is still hot. The top makes an airtight seal with the jar and the air trapped above the jam cools and so the pressure of the trapped air reduces. 6 cm Trapped Air JAM <- Lid Useful information: For the air p/T = constant assuming no air escapes/enters and the volume of the trapped air remains constant p = pressure of the trapped air T = Temperature in Kelvin Atmospheric pressure = 100 kPa (at room temperature) Absolute zero = -273 °C Calculate the force, due to atmospheric pressure, acting downwards on the top of the circular lid of the jam jar The jam and the trapped air were initially at a temperature of 85 °C when the jam was put into the jar and lid secured. Show that the pressure of the trapped air, once it has cooled to a room temperature of 15 °C inside the jar is approximately 80 kPa a) b) When jam is made, it is put into the jam jar and the top screwed down whilst the jam is still hot. The top makes an airtight seal with the jar and the air trapped above the jam cools and so the pressure of the trapped air reduces. 6 cm Trapped Air JAM <- Lid Useful information: For the air p/T = constant assuming no air escapes/enters and the volume of the trapped air remains constant p = pressure of the trapped air T = Temperature in Kelvin Atmospheric pressure = 100 kPa (at room temperature) Absolute zero = -273 °C Calculate the force, due to atmospheric pressure, acting downwards on the top of the circular lid of the jam jar The jam and the trapped air were initially at a temperature of 85 °C when the jam was put into the jar and lid secured. Show that the pressure of the trapped air, once it has cooled to a room temperature of 15 °C inside the jar is approximately 80 kPa

Answer rating: 100% (QA)

SOLUTION a To calculate the force due to atmospheric pressure acting downwards on the top of the circular lid of the jam jar we need to use the formul... View the full answer