Traditional Culture Encyclopedia - Weather forecast - In the weather of MINUS 20 degrees, how long does it take 50 tons of 20-degree water to become 0 degrees?
In the weather of MINUS 20 degrees, how long does it take 50 tons of 20-degree water to become 0 degrees?
The lower the freezing point, the better: the basic indexes of antifreeze are freezing point and boiling point. In general, the freezing point of the selected antifreeze should be lower than the local minimum temperature 10℃ to prevent sudden weather changes.
For example, the multi-effect antifreeze produced by Great Wall Lubricating Oil has a freezing point between -25℃ and -50℃, which can meet the antifreeze demand of vehicles in most parts of northern China.
Pay attention to the quality when using antifreeze. If the quality of antifreeze is poor or even inferior, it will not play a role in antifreeze. The cooling liquid is composed of antifreeze and water in a certain proportion. Automobile manufacturers usually specify the mixing ratio of antifreeze with different low-temperature antifreeze grades in the user manual, and also specify the types of antifreeze, which cannot be mixed.
Related knowledge:
When the depth changes little, that is, from a microscopic point of view, the temperature of surface water changes with the change of sunshine and air temperature. The temperature of groundwater is closely related to the ground temperature. Generally speaking, the temperature of groundwater is relatively constant. The deeper the groundwater, the more constant the water temperature. If the groundwater temperature changes sharply, it means that it is suspected of being polluted in health.
If the temperature of groundwater suddenly rises, it may be because of the influx of surface water with higher temperature. Water temperature will affect the growth and reproduction of bacteria in water and the natural purification of water. In addition, water temperature also has an important relationship with water purification and disinfection.
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