You can make an ice cube without a freezer using a vacuum pump, a bell jar, and a cup of water.
Here's a breakdown of the process based on the provided reference:
- Place the cup of water inside a bell jar.
- Connect the bell jar to a vacuum pump.
- Turn on the vacuum pump.
As the vacuum pump operates, it reduces the pressure inside the bell jar. This causes the water to begin to bubble and evaporate. The evaporation process requires energy, which is drawn from the water itself. As the water loses energy, its temperature decreases, eventually leading to the formation of ice. This process utilizes the principle of evaporative cooling, where rapid evaporation under low pressure causes a significant drop in temperature.
