Tutorial on how to make a small experiment with technology and DIY a scale that can weigh the air

Junior high school physics In the class, which one is lighter and which one is heavier, hot air or cold air? Xu Haoyang, a child from Xingtianhui Science Kindergarten’s Shenzhou, made a scale that can weigh air for everyone!
Making materials:
Paper, glue, candles, thin thread

Steps:< br />1. First cut two pieces of paper 34 cm long and 15 cm wide. Divide each piece into five parts as shown in the picture. The narrow part on the right is 2 cm wide and the rest are divided into four equal parts.

2. Follow Divide the paper strip into a square barrel shape, and use the narrow part 2 cm wide as the adhesive strip.

3. Press in the middle ends of both sides of the upper part of the square barrel and glue it Close it, glue a 20cm long thin line in the middle, and press the fold line on the lower section to form a square barrel shape. This is the weighing bag of the balance

4. Tailoring A 25cm long paper strip rolled into a thin stick, this is the weighing rod of the scale

5. Tie the two weighing bag mouths downwards to both sides of the scale stalk, tie a thin line in the middle of the weighing rod, and carefully adjust the balance.

6. Place a burning candle under a weighing bag (be careful not to burn the weighing bag)
What do you find? The weighing bag begins to rise immediately. And the other A weighing bag begins to fall. This shows that warm air is lighter than cold air!
Primary school students reveal the secret of technology production principles:
Because hot air has a smaller relative density than cold air, it is lighter than cold air. Cold air is light, and hot air balloons are made based on this principle.
Interesting science and technology production picture 3 - making a scale for weighing air. Materials: paper, glue, candles, thin thread.
Production Steps:
1. First cut two pieces of paper 34 cm long and 15 cm wide. Divide each piece into five parts as shown in the picture, with the narrow part on the right being 2 cm wide and the rest divided into four equal parts.
2. Fold the paper strip into a square barrel shape according to the dividing line, and use the 2 cm wide narrow part as the adhesive strip.
3. Press in the middle ends of both sides of the upper part of the square barrel shape, glue it, and then glue it in the middle. Glue in a 20 cm long thin wire, and press the fold line to form a square barrel shape at the lower part. This is the weighing bag of the balance.
4. Cut a 25 cm long paper strip and roll it into a thin stick. This is The weighing rod of the balance.
5. Tie the two weighing bag mouths downwards to both sides of the scale stalk, tie a thin line in the middle of the weighing rod, and carefully adjust the balance.
6. Light the handle A candle is placed under one weighing bag (be careful not to burn the weighing bag). The weighing bag immediately begins to rise. And the other weighing bag begins to fall. This shows that warm air is lighter than cold air! Why? Because heat Compared with cold air, the relative density of air is smaller, so it is lighter than cold air. Hot air balloons are made based on this principle.
Let me share with you some weighings of carbon dioxide. Methods and ideas:

Weighing carbon dioxide method Option 1: Use a balance to weigh the carbon dioxide.
Carbon dioxide weighing method Option 2: Find a one-meter-long light lever and hang the same paper bag in an equal-arm position. Pour carbon dioxide into a paper bag.
How to weigh carbon dioxide Option 3: Blow up a big balloon and put it into the air.
Method for weighing carbon dioxide Option 4: Use a pump to inflate the small balloon, put it into a large beaker, and then introduce carbon dioxide.
Method for weighing carbon dioxide Option 5: In a container with candles burning above and below Pour in the carbon dioxide.
Tutorial source: Internet