A little water experiment like this in rainy weather times? Why not?
![Vattenskål](https://blog.edu.turku.fi/scienceed/files/2019/10/water-2214921_960_720-231x300.jpg)
For this experiment you will need three bowls, big enough to bring down one or two hands.
Pour hot water in one, cold in another and room-temperatured in the third.
Put one hand in the warm water and the other in the cold. Hold them there for 30 seconds.
Then place both hands in the room-temperatured water. Do your hands feel the same?
Explanation: Human temperature sensation is sensitive to change. For example, when your hand is moved from cold to warm water, the body signals that the water is very hot – even if it is not.
Experiment: To make this study an experiment, try answering any of the questions below. Don’t forget to set a hypothesis and explain the result.
- What is the shortest time you have to keep your hands in the hot or cold water to achieve this effect?
- How do you feel if you hold your hands for a long time in the warm and cold water, respectively, before immersing them in the room-temperature water?
- How fast can you feel the temperature change?
- What is the smallest temperature difference you can have between the water in the bowls?
- Does it work if you dip one finger in each bowl only?