Playing with balloons and plastic bottles in this way not only makes children happy, but also gains little knowledge about environmental protection and the science of atmospheric pressure.

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3 small science experiments with balloons and plastic bottles on environmental protection, density and atmospheric pressure. Mom and dad bring kids to play at home!

The simple preparation of material allows children to learn great principles of science and spend weekend with their parents.

Jellyfish swim gracefully, but are very difficult to grow. Show your kids handmade jellyfish bottles and feel jellyfish swim.

Materials to prepare: empty bottle (best with a smooth surface), EVA foam, scissors, balloon, string, pigment, water

Reference steps:

1. Inflate a small balloon, tie a knot and tie 6-10 threads like a "jellyfish".

2. Gently insert balloon into bottle, fill the bottle with water and add one or two drops of blue food coloring.

3. Use EVA foam to cut out different shapes of nautical elements (such as beaches, starfish, seaweed, fish and foam) and decorate outside of bottle with them.

Scientific extension:

Air is lighter than water, and no matter how you turn bottle upside down, balloon will always rise to top of bottle, like a floating jellyfish.

Sea turtles feed on jellyfish. There are a lot of balloons and plastic bags floating in ocean that can easily be mistaken for jellyfish. Scientists have found that many sea turtles mistakenly think that plastic bags floating in sea are jellyfish, eat them and die due to intestinal obstruction.

This experiment allows children to visually see that air is taking up space, although we can't see it with naked eye.

Materials: plastic bottles, balloons, straws, plasticine

It's a good idea to have a waterproof tray or let your child use it in sink or bathroom.

Reference steps:

1. Using a sharp object or a pen, poke a hole in dry, empty bottle large enough for a straw to pass through, and then seal hole with plasticine.

2. Pour water into a bottle, rinse mouth of straw and see if water can flow out of straw?

3. Inflate a large balloon and ask child: "What's in balloon?" Press neck of balloon, put it on the neck of a plastic bottle and release. Is there a magic fountain?

Scientific extension:

The air from balloon is squeezed out into bottle, and water in bottle is squeezed out along straw like a fountain. Continue until air in balloon runs out or until water runs out of bottle.

If there is still water left in bottle, you can inflate balloon again, and after you put it on neck of bottle, water from straw will continue to splash down.

This is a fun science toy air cannon, when you pull balloon, air in bottle hits target just like a real bullet! Air guns have limited power and will not harm children.

The steps to make are very simple and once completed, you can play with your parents and friends.

Materials: bottle, balloon, scissors, cardboard, rope

Reference steps:

1. The parents cut plastic bottle in half, leaving only top. You can wrap cut with tape a little to keep it from being too sharp.

2. Once balloon is knotted, cut off bottom, unfold it, and carefully stand on edge of plastic bottle. Be careful not to break balloon.

3. Come up with several targets for shooting, tie them with thin wire and hang them in air.

You can now use your air cannon to hit your target! You can have a PK with your father!

Scientific extension:

The bottle is filled with air. After stretching and releasing balloon, balloon will bounce inward, and volume in bottle will instantly decrease, and air in bottle will also be compressed. Because there is only one outlet, air is drawn into this hole.

This air current can travel a certain distance without dissipating, and finally it can hit a target at some distance or extinguish a candle.

HandyKid focuses on educating kids about arts and technology, introduces fun science experiments, do-it-yourself tech projects, etc. that kids love, and usually recommends some good books and documentaries.

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