These experiments are from Robert Krampf - The Happy Scientist. How does hot air expand , and how does cold air contract ? Through an easy activity, using an empty bottle, a deflated balloon and hot water, kids will learn how and why air expands when it is heated up. For a gas, that means that the fast-moving molecules will bang into things often and hard. In this experiment we are just doing the same thing.

Rising air experiences a drop in temperature, even though no heat is lost to the outside. After a few minutes, the heat will cause the air in the balloon to expand, making the balloon begin to blow up. my guess would be 2 …

A plastic soda bottle (a 2-liter will work well) Duct tape. experiment - hot air expands, cold air contracts watch hot air balloons.

Water. A: What it means for something to be hot is that all the little parts are rattling around intensely. two jars with wide mouths. The drop in temperature is a result of the decrease in atmospheric pressure at higher altitudes. Another question if you compressed 2000cc of air in to a 1000cc bottle what would the pressure be? Description: When heated, air will expand. Equipment needed: A balloon. Hot air Balloon Experiments: Build an indoor hot air balloon made out of a plastic film dry cleaner bag [View Experiment]; Demonstrate how hot air expands a balloon and a cold air one contracts it [View Experiment]; Make a Hot air Balloon from a Teabag [View Experiment]; Hot Air Balloon Laboratory for Lesson Plans and Science Fair Projects [View Experiment]

The molecules of air are doing work as they expand.

We know that hot air expands. A soup pot.
The hot water balloon should get larger as the air expands as it gets warm and the cold water balloon should shrink as the air inside condenses. A stove.

When you heat up air it expands - if you heat it up by 30°C it will expand by about 10%. Thermometer Reading After the balloon test we used our thermometer to measure the water temperatures and then we wrote the temperature on our Hot and Cold Molucule Craft (See below). So I'm just wondering how much air expands with heat eg if you have 1000cc of air at 20C how many cc's will it be at say 40C is there a formula to work this out? When cooled, air will compress.

Hot air takes up more space than cold air.
This Week's Experiment - #275 Hot Air Bottle. Hot air takes up more space than cold air, as this experiment demonstrates. You wouldn't think it, but air is quite heavy, a cube 1m x 1m x 1m of air weighs about 1kg. This concept will also help them to understand the mechanism behind hot air balloons. This experiment uses hot water (or heating of water). Please execute this experiment only under the supervision of an adult. With the first successful flight occurring more than two hundred years ago in 1783, the humble hot air balloon will forever hold the record of being the first passenger flight device.

Hot Air Balloon Science Experiment.

- Anonymous. Even thought it was an accidental thing, it really is a great way to show how much air expands when it gets hot. What you need:. a skinny bottle with a narrow mouth (it needs to fit inside the jars) If the pressure of the surrounding air is reduced, then the rising air parcel will expand.

Hot Air Balloon Experiment is a simple science experiment to teach kids about the concept of warm air and cold air. Before we had helicopters, airplanes, or even blimps, there was only one way to travel the skies – in a hot air balloon!

In other words, the gas will exert more pressure on its surroundings. So inside a normal pedal bin liner there is probably at least 60-70g of air.

This happens because the hot water heats up the air inside the bottle. This week's experiment is a simple one that I came across while washing dishes. Fill a Balloon Using Warm Air is a simple science experiment that demonstrates one of the major properties of air. Experiment 2: Carbon Dioxide GasYou can also inflate a balloon slightly by making carbon dioxide gas. The warmed air expands, filling up more space inside the balloon.