Tuesday, 17 June 2014 14:58

## F4-33: PYTHAGOREAN CUP

• ID Code: F4-33
• Purpose: Demonstrate the siphon in a surprising way.
• Description: This special cup is designed to force the consumer to limit his or her intake of certain beverages to a modest amount. The cup is filled so that the liquid level is below a line about one inch below the top, a reasonable drink for temperate individuals. (Note that we avoid criticism by using water for the demonstration.) This works out fine, and the consumer may then drink at his or her leisure. If, however, liquid is poured into the cup above the level indicated by the line, the greedy consumer receives his or her just desserts as ALL of the beverage then is siphoned out of the cup through a hole in the bottom.
• Availability: Available
• #### F4-01: VISCOSITY OF LIQUIDS

Compare the viscosities of water and mineral oil. Read More
• #### F4-02: VISCOSITY OF AIR

Demonstrate that air is viscous. Read More
• #### F4-04: SILLY PUTTY

Demonstrate a non-Newtonian fluid. Read More
• #### F4-05: PARACHUTE TOY

Demonstrate how a parachute quickly reaches its terminal velocity. Read More
• #### F4-11: LAMINAR AND TURBULENT FLOW OF AIR

Demonstrate laminar and turbulent flow. Read More
• #### F4-12: UNMIXING - GLYCERIN AND DYE

Illustrate laminar flow by "unmixing" two fluids Read More
• #### F4-13: FLUID FLOW MODEL

For use as a model in developing equations for fluid flow. Read More
• #### F4-14: WIND TUNNEL

Show air flow around different objects. Read More
• #### F4-21: LIQUID IN SPINNING SPHERE

Show the behavior of a liquid when subjected to a centripetal force. Read More
• #### F4-22: SPINNING WATER BUCKET

Illustrate the reaction force on spinning water and the shape of the water surface. Read More
• #### F4-23: WATER PENDULUM

Show the surface of a container of water in a swinging pendulum. Read More
• #### F4-25: CYCLONE IN A BOTTLE

Illustrate vorticity in a perhaps tricky way. Read More
• #### F4-31: SIPHON

Illustrate how a siphon works. Read More
• #### F4-32: SIPHON - CHAIN MODEL

Illustrate how a siphon works. Read More
• #### F4-33: PYTHAGOREAN CUP

Demonstrate the siphon in a surprising way. Read More
• #### F4-34: SIPHON BALANCE

Demonstrate properties of the siphon using a counterintuitive example. Read More
• #### F4-41: DRUM AND CANDLE

Demonstrate the circular vortex. Read More
• #### F4-42: SMOKE RINGS USING GARBAGE CAN

Create large smoke rings and illustrate the circular vortex. Read More
• #### F4-51: VACUUM PUMP MODEL

Illustrate how a mechanical vacuum pump works. Read More
• #### F4-52: FORCE PUMP - MODEL

Demonstrate the operation of a force pump. Read More
• #### F4-53: ARCHIMEDES' SCREW

Demonstrate a pump mechanism invented by Archimedes. Read More
• #### F4-61: HERO'S FOUNTAIN

Illustrate fluid dynamics in a perhaps surprising way. Read More
• #### F4-63: MARIOTTE'S BOTTLE

Show the range of water jets from different heights along a water column. Read More
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