Without any doubt, the physicist - one of the most interesting sciences. Even the most useless experiments can be at the same time quite fascinating. For example, boiling of liquid at its cooling on the one hand seems improbable. That liquid began to boil it it is necessary to heat, but in any way not to cool as we got used to consider. But everything is possible. For a similar experiment any special liquid is not necessary, also ordinary water will approach, it is necessary to create special conditions only.
It is required to you
- Flask, water, gas burner, support.
Instruction
1. In a flask pour ordinary tap water, fill it approximately half level. After that, put a flask on the gas burner and heat water until it begins to boil.
2. When water in a flask begins to boil, turn off heating and wait for a boiling stop. Hermetically close a flask a rubber stopper and record it in the holder of a support, having turned upside down.
3. Further begin to water a flask bottom with cold water. The better cool a vessel, the experience will be more evident. Bubbles will rise to a water surface, water in a flask will begin to boil when cooling. It can be explained with the fact that the water vapors which are in a vessel when cooling begin to be condensed on flask walls. Because of it, pressure of water vapor in a flask begins to go down. With the lowered pressure water begins to begin to boil not at hundred degrees Celsius, and at lower temperature. As water still completely did not cool down, and pressure fell in a vessel therefore there is a boiling when cooling.