Have a strong student pull up on the scale, it takes well over N of force to dislodge the plate. Equipment 2. Shaving Cream Expanding as pressure decreases 6. Maximum expansion 7. Collapse as the vacuum is released. Department of Physics Higgins Hall Skip to main navigation Skip to main content. Unit Pressure Purpose Illustrate relative pressures, the strength of the atmospheric pressure Equipment Glass jar with a neck and a hole in the bottom Rubber balloon Rubber cork A small bucket Suggestions With the cork in place, balloon in the jar, ask a student to blow the balloon up.
Remove the cork, blow the balloon effortlessly When balloon fills the jar, replace the cork Fill the ballon in 3 with water from the bucket, remove the cork. Watch out! Discussion See attached. M-F2 : Hydraulic Lever. Unit Pressure Purpose Illustrate Pascal's principle Equipment Model hydraulic lever Suggestions Demonstrate the device Ask a strong student to hold down the larger piston while you push on the smaller.
M-F3 : Density Ball. Unit Density Purpose Illustrate the temperature dependence of water density, the Archimedes Principle Equipment Density ball Glass water reservoir Small water heater Thermometer Water bucket also, ice cubes Suggestions Ask a student to "check the ball out," ask whether it would float in room temperature water. Try it. M-F4 : Venturi Tube. Unit Bernoulli's Principle Purpose Classical illustration of the relationship between the speed and the pressure Equipment Venturi tube [a tube with short side-tubes avail.
M-F5 : Magdeburg Hemispheres. Unit Pressure Purpose Classical demo of the force due to pressure difference Equipment Small Magdeburg hemispheres Portable vacuum pump [NYA] Suggestions Pump the air out just so the sphere holds together, seperate the two parts with ease Pump the air out to minimum pressure. Ask a strong student to seperate the hemispheres Discussion. M-F6 : Equilibrium Tubes. Unit Pascal's Principle Purpose Classical illustration of the liquid-level in connected vessels Equipment Equilibrium tubes A stand Container with water plus dye , red wine, oi Funnel Suggestions Fill with water Fill with other liquids predictions?
M-F7 : Mariott Tube comp. With 1 and 2 open, ask for prediction and run With all open, ask for predictions and run Explain Discussion See attached Equipment and set-up Filling the tube to the brim Stoppers removed, liquid level continuously maintained Close-up of the streams: top and bottom arrive at the same point, middle stream goes farther.
