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Buoyancy in Air

PHY 200 & 230

Lab PDF 1
Lab PDF 2
Lab PDF 3

Loyd pre-lab #18 applies. Archimedes Principle and the standard textbook density of helium (corrected for current temperature & pressure) are used along with the experimentally determined mass and volume of a helium filled balloon to determine the density of air. Experiment can also be conducted or repeated with neon gas in place of helium if available.


Name Location Quantity
Tapes, Measuring JE-105A-D90 1 per table
String, Misc. JE-105A-S70,D70,D71 2 per table
Helium Tank w/ Balloon Nozzle JE-105A-(105 Door-R) 1 per room
Tape, Masking JE-105A-D63 1 per table
Barometer JE - 105, 107, 109 1 per room
Thermometer, Wall Mount - Battery JE-105, 107, 109 1 per room
Neon tank with balloon nozzle JE-105A-(105 Door-R) 1 per room
Balloon, 12" JE-105A-S50 2 per table
Fish Tank, Small, w/ Pulley & Bottles JE-113A-DS44-140 1 per room
Balance, Scale, Spring 20N MO-006A-DS2-401A&B&C 1 per room


String should be roughly one arm's length (~1m) long. Also, please use the cheapest common white string. Balloons must be at least 12 inch diameter type.

The room must be equipped with a box of large and a box of small paper clips placed on the back counter, and there must be direct access to a helium/neon tank with balloon nozzle. An assortment of slotted masses, barometer, and thermometer should already be present in each room.
The following items should be put on the SMALL STAINLESS-STEEL CART in the room: small fish tank with attached pulley, three plastic water bottles, bucket of misc balls, crystal model (stiff spring), and Newton spring scale. The fish tank is in the demonstration room (JE-113A) and contains the three bottles, one empty, one with water, one with sand. Do not put water in the tank. Leave it dry for instructor to fill as desired.

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Item modified on 2016-06-08 15:41:24 by damicoa6.