Much has already been said about the importance of maintaining the required level of humidity. Moreover, the well-being and health of a person is affected not only by too dry, but also too humid air, which is especially important for the winter period, when both options are very likely.
How to determine the humidity in an apartment or house? We will talk about 3 options for measuring humidity, which both require the purchase of the necessary devices, and methods that do not require any costs.

Hygrometer

The first and easiest way to measure humidity is to purchase a special device for measuring humidity - a hygrometer. There are several types of hygrometers, the operation of which is based on different principles.

When choosing a hygrometer, first of all, you should focus on its accuracy, you should not buy a device with a deviation in the measurements of more than 1%. It should be mentioned that now there are a large number of brands and types of hygrometers on sale, which can look like thermometers, like small wall or table clocks, can have both electronic and mechanical displays.

This method cannot boast of accuracy, but it is safe to say that every home has everything you need to measure humidity. A glass, some water and a refrigerator are all we need.

Pour into a glass or a glass of cold water and place it in the refrigerator for several hours until the temperature of the water in the container cools down to 3 - 5 ºС. Then place a chilled glass of water in the room where you want to measure humidity away from heaters or a hot battery and observe it.

• If the surface of the glass was first covered with condensate and fogged up, and then completely dried out within 5-10 minutes, the air in the room is very dry
• If within 5-10 minutes, after you placed the glass in the room, large drops of condensate formed on its walls and they began to flow down the walls of the glass, then the air in the room is very humid
• If after 5-10 minutes the surface of the glass has not dried up, but has not flowed either, then the air in the room is of medium humidity.

Measurement with a thermometer (according to the psychrometer principle)

The third method essentially copies the principle of operation of another device - a psychrometer. The room temperature is measured with a conventional mercury thermometer and recorded. Then the head of the thermometer should be wrapped tightly with wet gauze or cotton wool and after 10 minutes the temperature should be measured again.
Now we subtract the temperature of the “wet” thermometer from the temperature of the “dry” thermometer, and using a special table to determine the humidity in the room from the temperature difference.

The psychometric table can be found at this.