Q&A for How to Make Water Gel

It depends on what substance you are talking about. Water vapour turns to a gas at 100 degrees Celsius and it turns to a liquid below that temperature level. Some substances do not turn into liquids at all whether you heat it or cool it a good example is iodine, this is called sublimation.

No, it will not change to liquid state. The only way to liquefy agar is to heat it up to about 95°C (about 203° Fahrenheit).

For the first method, no, it is not safe. For the second method, it is likely safe as it is just agar and water, unless you have skin sensitivity to agar.

Hand sanitizer most likely would not use agar. You would usually use aloe vera gel, as it can help counteract the drying induced by alcohol.