Inflate the balloon and tie it tightly. Put in any container. First pour water over it, cooled in the freezer (up to 5 ° С), then hot water (70 ° С). Give an explanation of the observed phenomenon.
We know: gas pressure on the walls of the vessel (and on the body placed in the gas) is caused by the impact of gas molecules. And also, the gas pressure in a closed vessel is greater, the higher the gas temperature. In our case, the ball is a closed vessel; when dousing it with cold water, the temperature inside the ball decreases, which means that the gas pressure also decreases, so it will deflate. And if we pour hot water on our ball (70), we will see that it began to increase in volume, this was due to an increase in gas temperature, which led to an increase in pressure.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.