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Hoopman ScienceContract 24
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PressureGwen Nytes
Pressure-Force applied to an object The amount of pressure depends on the
depth and density of the object’s surroundings
Pressure
LABEgg in a Bottle
Show changes in pressure
Objective
Hard boiled egg (no shell) Matches Bottle Bundle of paper Scale
Materials
Put the bottle and all of the materials being used on the scale and measure the weight.
Light the paper and drop it into the bottle. Immediately put the egg on the mouth of the
bottle When the egg is in the bottle, turn the bottle
upside down so that the egg is on the neck of the bottle.
Tip your head back, put your mouth over the opening and blow hard into the bottle.
Remove your face from the bottle and hold it upside down.
Observe what happens
Procedure
When the burning match is in the bottle and you put the egg on top, it cuts off all of the oxygen coming in. When the match burns it uses oxygen and gives off carbon dioxide and water. In the jar, with no oxygen remaining and just water in there, the egg will fall in, because water is less dense than the surrounding air.
When you blow in, you increase the pressure inside the bottle, so when you take your mouth away, the egg falls out.
Explanation
When you measure the weight and the materials before the experiment and weigh them again when your done, you will find that it got lighter. This is because the oxygen was giving it the original density, and when the oxygen went away, it got lighter.
Calculating Pressure
Newton’s 3rd Law – For every action there is an equal and opposite reaction
Newton’s 3rd law relates to this activity, because when you change the pressure inside the bottle, it causes the egg to fall in and come out.
Newton’s Laws and Pressure