Gas pressure and temperature
In a A reaction vessel where no reactants or products can escape or are lost to the surroundings. where the The volume of a three-dimensional shape is a measure of the amount of space or capacity it occupies, eg an average can of fizzy drink has a volume of 330 ml. stays the same, the Force exerted over an area. The greater the pressure, the greater the force exerted over the same area. of a gas increases as the A measure of the average kinetic energy of particles in a substance. increases.
This is because the gas A general term for a small piece of matter. For example, protons, neutrons, electrons, atoms, ions or molecules. travel faster at higher temperatures. They collide with the walls of the container more frequently, and with more A push or a pull. The unit of force is the newton (N)..
This means that there is a A relationship tells us how two or more variables work together, eg the relationship between resistance, voltage and current is: resistance = voltage 梅 current. between Force exerted over an area. The greater the pressure, the greater the force exerted over the same area. and temperature. A graph of pressure against temperature can be produced, using a pressure gauge connected to a flask of air which is then heated.
In a fixed volume of gas the pressure is When two quantities have the same ratio or relative size. For example, current is proportional to voltage if the current doubles when the voltage is doubled. to the temperature.
Notice that the graph can be extrapolated back to a temperature at which the gas would have no pressure. This is -273掳C and is called A temperature where the kinetic energy of a particle is zero, eg absolute zero has a temperature of 0 K.. At this temperature, the particles would not be moving at all.