Air exerts a on the walls of its container. Air Pressure is due to the of the molecules in the air as they

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1 Lesson 1,2: What is Air Pressure? Air exerts a on the walls of its container. This is often called Pressure. Air Pressure is due to the of the molecules in the air as they collide with the walls. Air has. Moving air has pressure than still air. The Magdeburg Hemisphere The sucks out any air/gas from inside the two hemispheres. Therefore, the only air particles that are hitting the hemispheres are on the, keeping the hemispheres. force, pressure, weight, together, Atmospheric, container, less, outside, pump 1 P a g e

2 Lesson 3: The Fizz Bang challenge The reaction between the water and tablet releases more and more. The pressure inside the canister as there are more and more particles with the container walls. Eventually the acting on the lid is enough to remove it and there is a force from the canister on the fluid, it down out of the bottom. There is an and opposite force from the fluid to the canister forcing it (Newton s 3 rd Law) increases, chemical, gas, upwards, force, colliding, equal, pushing 2 P a g e

3 Lesson 4: Kinetic model of gases Kinetic Theory is a set of used to explain how gases behave using the idea of moving particles. The of a gas is the space the move around in The temperature of a gas is proportional to the average energy of the particles. So the faster the particles are moving the is their temperature. The pressure of a gas is a measure of how and how hard the particles hit the of the container. particles, higher, walls, microscopic, ideas, kinetic, volume 3 P a g e

4 Lesson 5: Why is it a bad idea to put closed containers into a fire? The pressure of a gas as its temperature increases. This is because the particles move faster and strike the container walls and more. So when a container is put into a bonfire the particles of air start moving and gain more and more energy. This increases the inside the container and eventually the can will. This could lead to serious to anyone standing near the. often, explode, increases, fire, pressure, faster, kinetic, harder, injury 4 P a g e

5 Lesson 6 The strange case of the Cartesian Diver The volume of a gas decreases as pressure (temperature doesn t change) This is because the particles travel between collisions with the walls so there are collisions each second so lowering the pressure. So how does the Cartesian Diver work? Squeezing the bottle forces more up inside the diver. This the gas inside the diver, and the diver now displaces less water so its rises. If the diver s density is than the density of water the diver will sink. When pressure is released, it displaces more water, becomes less that the water and again. fewer, increases, dense, density, further, compresses, water, bigger, rises 5 P a g e

6 Lesson 7 Make an AIR thermometer The volume of a gas increases as its temperature (pressure doesn t change). In warm conditions the gas its volume increases as gas particles move around more. How it works the balloon in boiling water The balloon in the boiling water. This happens because when the gas in the balloon heats up its particles move and temporarily increases the pressure. This causes the to expand. The pressure falls as the volume gets, and stops increasing when the pressures inside and outside the balloon are. How it works the air thermometer. In cold conditions the gas in the tube and straw contracts its volume decreases as in the gas move around less quickly. In warm conditions the gas expands its volume increases as gas particles around more quickly. The marker will always move to a position where the pressure at each side of the marker is the (atmospheric pressure). move, increases, same, faster, balloon, equal, expands, particles, quickly, bigger, decreases 6 P a g e

7 Lesson 8 Water bottle rockets How it works: Now this IS Rocket Science!! 1. When air is pumped into the bottle, the air pressure inside the bottle. 2. This is because there are more colliding with the bottle walls and water surface every. 3. Eventually the increased pressure causes a on the cork that is greater than the force holding it to the bottle 4. When the cork is forced off, the rushes out. 5. This is because the pressure inside the bottle is greater than pressure. 6. The force of the air bottle on the water is and opposite to the force of the water on the air bottle s 3 rd Law. 7. The bottle is therefore forward as the water is thrown backwards. frictional, second, rises, equal, projected, atmospheric, Newton, force, particles, water, air 7 P a g e