## Liquids and gases: principles of fluid mechanics by Paul Fleisher

By Paul Fleisher

Discusses the clinical rules of fluid mechanics that permit basketballs to dance and hot-air balloons to upward thrust, demonstrating the habit of drinks and gases via uncomplicated illustrations and experiments.

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Extra resources for Liquids and gases: principles of fluid mechanics

Example text

Inversely proportional” means that as the pressure on the gas increases, the volume decreases. We often see Boyle’s law at work in our everyday world. Boyle’s law explains why a bicycle pump works. As 29 Boyle’s and Charles’s Laws When the same amount of gas is squeezed into an increasingly small space, its pressure increases. Liquids and Gases 30 you push down on the handle of a bicycle pump, the air inside is forced into a smaller and smaller space. As the air’s volume decreases, its pressure increases.

Add or remove a few drops of water at a time until the diver floats, as shown in the diagram above. Once you have the right amount of water in the dropper, transfer it to the tall plastic bottle full of water. Be careful not to lose any water by squeezing the rubber bulb as you pick it up. Then tighly screw the top onto the bottle. Squeeze the sides of the bottle with your hands. The medicine dropper should dive to the bottom of the bottle. It will stay there as long as you keep the pressure on the sides of the bottle.

You should notice something interesting happening to the water level inside the dropper. When you apply pressure, a little more water goes up into the dropper. When you release the pressure, the water level in the dropper goes back down again. The pressure from your hands is transmitted through the water and pushes on the air in the dropper. Boyle’s law tells us that when the pressure on a gas increases, its volume decreases. The water, pressing on the air in the dropper, squeezes the air into a smaller space.