·5.19 use the relationship between the pressure and volume of a fixed mass of gas at constant temperature:p1V1 = p2V2
p1 = Pressure at the beginning [kPa, bar or atm]V1 = Volume at the beginning [m3 or cm3]p2 = Pressure at the end [kPa, bar or atm]V2 = Volume at the end [m3 or cm3]
(Note: can use any units for V and p as long as they are the same at the beginning and end)
Fun with the vacuum pump!·Marshmellows· Food colouring in pipettes· Surgical gloves5.19 Ideal graph and conclusion
Why do the eggs get sucked into the bottles?!Explanation
· The burning paper in the bottle heats the air in the bottle· When the egg gets placed on top, the oxygen supply in the bottle is rapidly depleted and the paper goes out· The bottle is sealed by the egg and now has a constant volume of gas inside· The hot gas in the bottle now starts to cool which reduces the pressure inside the bottle· The pressure outside the bottle remains unchanged and so there is now an unbalanced force on the egg which accelerates the egg into the bottl
e· 5.17 describe the qualitative relationship between pressure and Kelvin temperature for a gas in a sealed containerInstructions
·Put 5 pumps of gas in· Set volume as the Constant Parameter· Heat to 1000K· Watch what happens to the Pressure
Conclusion
· If you increase the temperature, you increase the pressure
