Why is the weather forecast not 39 degrees?

Because the temperature is measured in the blinds. The shutter box is placed on the lawn, which is not affected by direct sunlight, wind, rain and natural ventilation. The thermometer is placed in a louver and measured at 1.5 meters above the ground.

According to the relevant laws and regulations of our country, once the outside temperature reaches or exceeds 40 degrees, the operation should be stopped immediately, and the working time of the staff should not exceed 6 hours, and the staff should not work overtime if it exceeds 39 degrees.

This is the standard set by the World Meteorological Organization. It represents the undisturbed standard air temperature in the natural state. Usually, the temperature in the weather forecast represents the temperature in nature. The most basic hygrometer is glass hygrometer, including the highest hygrometer and high and low hygrometer.

For some cities, the temperature of 40 degrees is sometimes broadcast, but such a situation is rare. Generally speaking, meteorologists will compare the recent temperature, and if it is serious, such as the actual temperature of 4 1 degree, they will report 40 degrees.

Maximum thermometer:

It is specially used to measure the highest temperature in a certain time interval. Its structure is that a glass needle is arranged at the bottom of the ball and extends straight to the capillary hole to narrow the capillary hole. As the temperature rises, mercury expands and the pressure increases, forcing mercury to squeeze through the thin tube and rise.

When the temperature drops, because there is not enough pressure to make mercury squeeze through the tubule and return to the ball, the mercury column will break at the tubule, so the top of the mercury column above the tubule will keep the highest temperature indicated by the thermometer in the past period of time, so the highest temperature can be measured.