Is it easy to blow out a candle? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Is it easy to blow out a candle? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

For aviation, shipping, and construction, it is very important to know how the air flow behaves depending on the size and shape of the obstacle in its path. Often this is studied on small models and mock-ups. Sometimes experiments give unexpected results.

Place a large bottle on the table, and behind it, at a distance of 120-150 mm, a lit candle or spirit lamp. Bring your face closer to the bottle at a distance of 200-250 mm and boldly blow with all your might. You can think that the flame will continue to burn, because it is closed from you by the bottle. But the flame goes out. What's the matter? Why didn't the bottle block the air stream?

Is it easy to blow out a candle?

Air jets enveloping the bottle meet a more rarefied space behind it and, rushing into it, together give a directed strong jet that extinguishes the flame.

Here are some more experiences.

Is it easy to blow out a candle?

Take a funnel made of paper or cardboard and try blowing out a candle through it. Of course, you will try to blow so that the axis of the funnel passes through the center of the flame. It turns out that this is not an easy task. The flame of the candle will not only not go out, but on the contrary, it will turn in the direction, as it seems to you, of the strongest flow.

Is it easy to blow out a candle?

If you put the funnel so that the flame falls on the continuation of the line of the wide edge of the funnel, then the candle can now be blown out very easily. The flame will deflect forward and go out.

Experience shows that the air stream in the funnel spreads along its walls.

We recommend interesting experiments in physics:

▪ Carthusian diver

▪ Pendulums with a hippopotamus and a bird

▪ parachute models

We recommend interesting experiments in chemistry:

▪ The beam fell on the crystal

▪ chemical clock

▪ Copper battery

See other articles Section Entertaining experiences at home.

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