According to the query on Baidu library, here is the method to determine when the water temperature reaches 40 degrees:
1 If the water temperature is 40 degrees, you can use the inside of your wrist, which is the pulse point, to test the water temperature. For drinking noodles, the water temperature of 40 degrees does not feel hot when you drink it and is slightly higher than the human body temperature. Human body temperature is generally 37 degrees, so water at 40 degrees will be very comfortable, while water at 45 degrees will be a little warm. Package 2. It is recommended to purchase a thermometer to measure whether the temperature reaches 40 degrees. This is the most direct and accurate way to judge water temperature.
When we talk about water temperature in daily life, it only refers to the temperature of the water. In geography, the temperature ofwater refers to the temperature of groundwater. The generally referred to groundwater temperature refers to the temperature of the water in the earth's crust. The tropical ocean is large enough. This ocean requires not only that the sea surface temperature be above 26.5°C, but that the water temperature in a 60 meter deep layer of seawater exceeds this value. The vast surface of the ocean is the natural environment necessary for typhoons to form. Due to the friction between air molecules inside the typhoon, an average of 3,100 to 4,000 calories/cm^2 of energy is consumed each day. released by the vast tropical ocean. Only latent heat can be supplied.
Measure the water temperature at 40 degrees.
If you don't have a thermometer, you can use your body temperature to roughly estimate whether the water temperature has reachedint 40 degrees. Because the human body temperature is generally 37 degrees, water at 40 degrees will feel very comfortable. At 45 degrees it will be a little warm, so without a thermometer, if you feel the water temperature is comfortable when your body touches it, the water will be around 40 degrees. Of course, if you want an accurate temperature, you should always use a thermometer to measure it.
If the lukewarm water we drink is not particularly hot, the acceptable temperature is generally around 30 degrees. If it is a little warm after entering the mouth, it will be around 40 degrees. If possible, it is best to use a thermometer to measure it. There are usually mercury thermometers specifically designed to measure water temperature, which will be more accurate.
Temperature and water changes:
Water temperature is related to water depth'water. At a certain temperature, the deeper the depth, the higher the water temperature. Of course, at the same depth, the temperature is higher and the water temperature is higher.
When the depth does not change much, that is, from a microscopic point of view, the surface water temperature changes with changes in sunlight and water temperature. 'air. Groundwater temperature is closely related to soil temperature. Generally speaking, the temperature of groundwater is relatively constant. The deeper the groundwater, the more constant the water temperature. If the temperature of the groundwater changes drastically, this may indicate that it is contaminated from a hygienic point of view.
If groundwater temperatures suddenly increase, it may be due to a large influx of higher temperature surface waters. The water temperature canaffect the growth and reproduction of bacteria present in water as well as the natural purification of water. Additionally, water temperature also plays an important role in water purification and disinfection.