Make sure the mouth of the bottle is not touching the bottom of the cup, but is at least below the waterline. Before weather satellites and radar systems could precisely measure the weather, people depended on simple barometers to measure air (or barometric) pressure. About: Likes wire work, arts & crafts, reading, cooking and baking. A plastic soda or water bottle with lid, size not important! Using a vacuum inside a plastic bottle with water in it, you can observe the changing air pressure with this simple barometer. This is an easy project and would make a great science experiment. Make sure the cover is airtight.Place the straw in the center of the cover with about one-third extending past the edge of the can.Tape the toothpick to the end of the straw that extends past the can's edge. A barometer is a really interesting measuring device. A rise in the level indicates an increase in barometric pressure, and vice versa.Calibrate the numbers on the ruler to the true barometric pressure by comparing it with local weather reports. ... Make sure that the level of the water extends into the neck of the bottle. It was called the You will need a narrow necked bottle, a rubber stopper, a clear straw or piece of plastic tubing (the longer the better), some flexible window sealant, some water and some optional food coloring.The hardest thing to do in the making of this device is to bore a hole through the centre of the rubber stopper and fit the straw or tube into it. If it leaks, dump the water out and apply a good size bead of low-heat glue around the tubing on the bottle. You can make one with just a few found around the house materials. 8 years ago This is to ensure you get a tight seal. A rise in the level indicates an increase in barometric pressure, and vice versa. Water Air Tubing, such as from an aquarium or oxygen use about 1 3/4 the length of the bottle. Let cool, and check for leaks again. And it is really easy to make. and how they will affect tomorrow’s weather. In this tutorial I show you how to make a barometer and give you all the information you need so you understand how it works and why. Alternitavely, you can mix the water and food coloring prior to pouring into the bottle.Place your barometer in an area where it won't be disturbed too much. Each time you move the bottle, unscrew the lid and retightened the lid to give you the proper vacuum. The higher it points the greater the barometric pressure, and vice versa.Tape the ruler securely inside the jar with the numbers facing inside the jar.Tape the straw to the ruler so that it doesn't block the numbers. So, as the air pressure outside the can changes, you will see the balloon either rise above the top of the can or sink into the can. Once the system has stabilized, changes in atmospheric pressure will cause the level of water in the tube to rise or fall.

Secure the plastic wrap with the rubber band. See if you can work out the reason for this - think about which lot of water is directly in contact with the outside air. The basic principle behind the device was that a body of air trapped inside a device sealed by water that was open to the atmosphere through a column would expand or contract and thereby push or suck in the water column according to the difference in pressure … Torricelli's barometer was the model for all mercury based barometers for the next two centuries, and providedan easy, if not always convenient way of measuringair pressure.But at much the same time, a more simple method became popularfor predicting changes in the weather. Water can be used, but water evaporates quickly and is heavier than mineral oil.

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