Vanderbilt Student Volunteers for Science

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Presentation transcript:

Vanderbilt Student Volunteers for Science VACUUMS Vanderbilt Student Volunteers for Science

What is a Vacuum? A space in which there is no matter OR essentially a space where all gases are removed so there is no air pressure In the REAL world, the closest thing to a perfect vacuum is OUTER SPACE

More About Vacuums….. Earth is NOT a vacuum because GRAVITY prevents gases from ESCAPING Earth therefore has ATMOSPHERIC PRESSURE

What is AIR PRESSURE? Weight of the atmosphere pressing down on EARTH Measured by a BAROMETER Air pressure at SEA LEVEL is 14.7 psi Air pressure changes with ALTITUDE

Experiment Questions: What happened to the balloon in the jar? Now what happens to the balloon when you loosen the connection between the hose and the base? Now what happens when we do the experiment with a marshmallow?

Magdeburg Hemispheres Magdeburg Hemispheres are a pair of large copper hemispheres with mating rims Used to demonstrate the POWER of ATMOSPHERIC PRESSURE When the rims were sealed with grease and the air was pumped out, the spheres could not be pulled apart BY A TEAM OF HORSES!!!!!!