We heat the cut glass. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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We heat the cut glass. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

First, seal the edges of the glass from the inside with strips of white and black paper. The glass became striped like a zebra! In this glass you need to put a candle, so that it stands exactly in the middle. To do this, prepare several cardboard circles of such a diameter that they just fit into the glass. In the middle of each circle, cut a round hole the size of the candle. In order for the holes to be exactly in the middle, they must be drawn with a compass from the same center from which you drew the circumference of the circle.

Glue the cloves to the outside of the glass with stearin. To each face of carnations. And all at the same height. Let's say 2 cm below the edge. It is convenient to glue, holding the glass horizontally in the left hand, and with the right, applying a carnation, dipped with a hat in stearin, each time to the upper edge. Count how many nails you put on. Usually a glass has eight sides, which means that there will be eight carnations.

Now everything is ready, the experiment can begin. Put the glass on a plate, put cardboard mugs into it, and carefully insert a piece of candle into them of such a height that the wick does not reach the edge of the glass a little. Light a candle and see what happens next.

We heat the cut glass

A minute passes, then another... Everything is quiet. But here - click! The first carnation fell into the plate. Click, click! Second and third. Click! Fourth.

That's enough, put out the candle. Half of the carnations remained on the glass, did not have time to peel off. And look how interesting: they all remained on the white edges. And they fell off the blacks! Why?

The candle here did not heat the glass in the same way as it heated the long nail in the previous experiment. The flames did not lick the glass. The glass was heated simply because the rays from the candle fell on it. In this way, for example, the Sun heats our planet, And in the summer, when the sun's rays fall the most, they tell you: dress in white! Don't wear black clothes, it's hotter!

White color reflects the rays falling on it. And black absorbs them. That is why the black edges heated up faster, and the carnations peeled off from them in the first place.

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

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