One of the most amazing highlights of my trip to Dubai was the opportunity to fly in a hot air balloon with Balloon Adventures Emirates. It was incredible! The hot air balloon ride is the inspiration behind The Hot Air, Cold Air Science Activity. There is so much science behind the idea of hot air balloons and I thought that sharing the photos with my children of the balloon ride would be a great opportunity to extend this learning into a science activity.
This Hot Air, Cold Air Science Activity is a great experiment to watch the effects of hot air and cold air on a balloon. This activity is a great opportunity for kids to talk about what they can see and why it is happening. Kids will absolutely love this activity and will see, first hand, what effects hot and cold air has on a balloon.
What you will need?
You will need two containers, one filled with hot tap water and the other with ice and cold water. You will also need 1 balloon and a 1.25litre (or 2litre) plastic soft drink bottle. The larger the bottle the more room the air has to push up and expand.
Please do not use boiling hot water for this activity. Hot water from the tap will effectively work for this activity.
- Blow the balloon up to stretch it and help make it more flexible and let the air out.
- Place the balloon over the mouth of the empty plastic bottle.
- Stand the bottle in the centre of the container filled with hot water. Wait a few minutes and notice the balloon start to inflate and expand.
- Remove the bottle from the hot water and place it in the container with cold water and ice. Wait a few moments and notice that the balloon starts to deflate and contract.
- Repeat step 3 and 4 again….it’s amazing!
Science activities and experiments are a great opportunity to make connections between real life experiences such as the hot air balloon ride. It encourages children to ask questions and promote scientific thinking such as making predictions, observations, comparison, reasoning, data gathering, experimentation and evaluation.
Other Learning Opportunities
- Language development: Using descriptive words to express ideas and opinions.
- Cause and Effect
What is happening?
When the air inside the plastic bottle is warmed, it expands and needs more space, therefore it stretches out the balloon. When the bottle is transferred to the icy cold water, the air is cooled; it contracts and needs less space, so the balloon deflates. The mass of air remains constant inside the bottle, so this shows that the warm air requires more space and is less dense than cool air.
Original article and pictures take http://www.learning4kids.net/2015/01/15/hot-air-cold-air-science-activity/ site