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Volume is not a reliable measure of how much gas there is either, since it will change with termperature and pressure.Ī mole of gas is 6.02 x 10 23molecules - this is Avogadro's number.Īvogadro defined the mole as the number of molecules in at standard temperature (273K/ 0 oC) and pressure (100,000Pa/ 1atm) one mole of any gas occupies 0.0224m 3. Measuring the mass of a gas is not easy (or practical given the significant buoyancy force on a light container of a gas). The dependance of the behaviour of a gas is obviously linked to how much gas there is.
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Thus when the particle's kinetic energy drops to zero (absolute zero), it can no longer exert a pressure on its container walls. The average kinetic energy of a particle of a substance defines that substance's temperature. In order to exert pressure, gas particle must be moving, and thus have a kinetic energy. Important note: This is where our concept of absolute temperature comes from. Number of molecules of gas- How does this affect pressure? Why? Pressure- What causes it? How is it affected by temperature? Why? What properties of a gas depend on temperature? Use the heat/ molecular motion applet under this link to find out and explain: Use the other arrow buttons to remove points or clear the graph. Type in the values of the points and click the arrow button to plot them. Use in conjunction with the Pressure experiment to plot the results obtained. A blank graph plotting Pressure (in kPa) against Temperature (in ☌).