Inflate the balloon and tie tightly. Place in any container. First, pour it over with water cooled in the freezer (up to 5 ° C), then hot water (70 ° C). Give an explanation for the observed phenomenon.
If you pour chilled water over a balloon, the volume of the balloon will decrease. If, after that, the balloon is poured with hot water, then the volume of the balloon will increase. This effect is explained by the fact that as the temperature decreases, the air molecules in the ball begin to move more slowly and, to a lesser extent, “bombard” the inner surface of the ball. The internal pressure of the ball decreases and under the influence of the elastic force of the rubber, the ball decreases its volume. When heated, the opposite process occurs – the air molecules of the ball begin to move faster and more “bombard” the inner surface of the ball. Internally, the pressure of the ball increases. And under the influence of increased pressure, the ball increases its volume.
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