Physics
Lab 2.5 Gases
Overview
The purpose of this
laboratory class is to demonstrate some of the properties
of gases. A hot air balloon illustrates buoyancy in air
due to the mass of air. We also use two pieces of a
drinking straw to illustrate the Venturi effect.
Experiments
1 Use a garbage bag, a
piece of aluminum foil and some fuel gel to make a hot
air balloon
2 Demonstrate the Venturi
effect using a drinking straw
Experiment
2.5.1 Hot Air Balloon
Equipment
Black garbage bag
Duct tape
Aluminum foil
Fuel (Sterno)
IMPORTANT
SAFETY NOTICE
- This experiment
should not be attempted without responsible adult
supervision.
- Working with
flammable materials is extremely dangerous.
- Ensure that the
balloon is tested well away from any flammable
materials and that there is no danger of fire
being caused if some of the burning fuel spills
from the holder on the balloon.
- Ensure that the
balloon is tethered and not allowed to fly
uncontrolled.
- The experiment should
also be carried out on a still day. Any wind
could carry the balloon – and the burning
fuel – towards flammable materials. (e.g.
dry plants etc.)
Procedure
- Assemble the balloon
as illustrated in the video lesson.
- Attach a light thread
or some thin nylon line near the top of the
balloon to ensure that it does not move into
places unknown and cause a fire.
- Experiment with
different sized bags and different quantities of
fuel.
Experiment
2.5.2 Venturi
Equipment
Drinking straw
Small container of water
PROCEDURE
Carry out the experiment as illustrated in the video
lesson
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