Summer is the hottest.

Dog days are the hottest time in summer.

"Three volts" refers to the first, middle and last three volts, which is from mid-July to mid-August every year. After the summer solstice, although the days are getting shorter and the nights are getting longer, the days are longer than the nights in a day. Every day, the ground absorbs more heat than it emits, and the temperature near the ground is getting higher every day.

During the "three volts" period, the heat absorbed by the ground is almost less than the heat emitted, and the weather is the hottest. After that, the heat absorbed by the ground began to be less than the heat emitted by the ground, and the temperature gradually decreased. Therefore, the hottest time of the year generally appears in the "dog days" from the summer solstice. The hottest time in the dog days is in the middle, usually ten to twenty days.

Preventive measures in dog days

1, avoid blowing cold air for a long time, and open doors and windows at night to prevent evil wind. Be careful not to touch the cervical vertebra when blowing air conditioning, or enter the air-conditioned room when sweating, which will cause disease; The air conditioning temperature should be suitable, and it is recommended to be around 26℃; When blowing the air conditioner, open the window to ensure the convection and ventilation of indoor and outdoor air.

2, self-activity, sweating, and hot weather, many people like to stay at home and don't want to go out. In fact, eliminating dampness and dispelling cold, in the final analysis, is to increase your yang, which is vigorous, while natural cold does not invade your body. Go out properly in dog days, sweat more and grow yang.

3, summer exercise should pay attention to, do not exercise vigorously, otherwise the yang will be discharged with sweat, the qi machine will be injured, water and water metabolism will be affected, the water in the body will come out, and eventually the water will not be discharged. Especially those who are weak and can't stand the heat can go out in the morning and evening.