Hands-on experience: The temperature of our hands is about 30 degrees (not body temperature, but about 37 degrees, because the temperature of our hands is not as high as body temperature because of long-term exposure), and the water temperature higher than body temperature will feel hot. At this time, the water temperature is about 40 degrees. I feel very hot, which means it's at least over 45 degrees.

Manual measurement is unacceptable. But if there are no small bubbles at the bottom of the pot (referring to continuous heating), the water temperature is about 60 degrees at this time. If there are bubbles, they are still very small, and the water temperature is about 70 degrees.

Judging that the water temperature is about 50 degrees, you can taste it in addition to the feel. The tongue does not feel warm, indicating that the water temperature is below 70 degrees.

Introduction of water temperature:

Talking about water temperature in life only refers to the temperature of water. In geography, water temperature refers to the temperature of groundwater. Generally speaking, groundwater temperature refers to the water temperature in the crust.

A sufficiently broad tropical ocean surface requires not only that the surface temperature of seawater is higher than 26 .5℃, but also that the water temperature exceeds this value in a layer of seawater 60 meters deep.