Why is the most suitable temperature for the human body around 25 degrees?
Scientific research has found that the environment at 25°C is the most suitable for human life
Under this temperature, the human body has no sense of heat or cold. The capillaries within the body are opened and balanced, feeling very comfortable. The most suitable temperature for the human body in summer is slightly higher than 25 degrees Celsius, that is, 26 to 28 degrees Celsius. When the temperature begins to rise below 32°C, the human body begins to heat up and the mood will fluctuate. At this time, we need to implement some measures to regulate our body temperature
However, according to medical and health care test data, when people's stable body temperature is 37 degrees Celsius and the temperature of the human skin surface is about 33 degrees Celsius, it will occur. problem. Why is the most suitable temperature for the human body around 25 degrees, not around 33 degrees?
According to research by physiologists, when the indoor temperature is too high, it will affect the body's temperature regulation function. Due to poor heat dissipation, body temperature will increase, blood vessels will expand, pulse and heart rate will increase. In winter, if the indoor temperature is often above 25, people will feel tired, dizzy, clumsy thinking and poor memory. At the same time, due to the huge difference in indoor and outdoor temperatures, the human body has difficulty coping and is prone to getting sick and catching colds. If the indoor temperature is too low, the metabolic function of the human body will decrease, the pulse and breathing will slow down, the blood vessels under the skin will constrict, the resistance of the respiratory mucosa will also be weakened, and respiratory diseases will easily occur. Therefore, scientists set the lower limit temperature of "cold tolerance" and the upper limit temperature of "heat tolerance" to 11 and 32 respectively.
While paying attention to indoor temperature control, we should also pay attention to indoor humidity
In summer, when indoor humidity is high, it will stimulate the body's heat dissipation, making people feel very hot and irritable. In winter, when indoor humidity is high, heat conduction will be accelerated, making people feel cold and depressed. When the indoor humidity is too low, due to a large amount of water loss from the upper respiratory tract mucosa, people will experience dry mouth, moist tongue, and even sore throat, hoarseness and nosebleeds, making them prone to colds. Therefore, experts believe that the upper limit of relative humidity should not exceed 80, and the lower limit should not be lower than 30
The human body's feelings are not directly affected by temperature or air humidity, but the result of the combined effect of the two. The most suitable indoor temperature and humidity are: winter temperature 18 25 ℃, humidity 30 80 ℃; summer temperature 23 28 ℃, humidity 30 60 ℃. People with a score higher than 95 will feel more comfortable within this range. In an air-conditioned room, people will feel most comfortable when the indoor temperature is 19 to 24 degrees Celsius and the humidity is 40 to 50 degrees Celsius. If the impact of temperature and humidity on people's thinking activities is taken into account, the most appropriate room temperature should be 18°C and the humidity should be 40-60°C. At this time, people are in good mental state, their thinking is the most flexible, and their work efficiency is high
When a person's normal body temperature is 37 degrees Celsius, the surface temperature of human skin is about 33 degrees Celsius. When the indoor temperature is higher than 33°C, it feels hot, and when it is lower than 13°C, it feels cool. However, when the environmental conditions are 25, the equivalent humidity is 50, and the wind speed is 0.15m/s, the human body is in the most normal and perfect thermal balance state, that is, it feels the most comfortable.
Therefore, in addition to temperature and humidity , air circulation will also affect the human body's feeling of temperature. Humidity and air circulation affect the body's heat dissipation. If the heat dissipation and heat production in the human body are imbalanced, the human body will feel deeply uncomfortable. In the South, the humidity is quite high and even if the temperature is not very high, it can be deeply unpleasant. Therefore, it may be more comfortable to be in a desert with high temperature and low humidity than in the south with the same temperature but high humidity.
Feng Shui masters attach great importance to the orientation and sunlight of the house
In ancient times, Feng Shui masters attached great importance to the orientation and sunlight of the house. They often pursue sunny houses and tell people not to live in shady houses. The book of Feng Shui says: How do you know that people are blessed when the three yangs hit them directly? How do you know that people can live a long life and enjoy the sun without any worries? It also emphasizes what a gable should look like and what a courtyard wall should look like. These can not only obtain good residential sunshine and improve the sanitary conditions of the residence, but also have a lot to do with maintaining the temperature of the residence.
If the indoor temperature is too low or too high, it will cause adverse consequences
The microclimate of the residence should ensure that the body temperature and heat of the residents are roughly balanced to prevent the body temperature regulation function from being in a state of tension for a long time, and have a good feeling of warmth and stability It refers to the body's heat production, body temperature, skin temperature, skin sweating amount, and the body's heat production, body temperature, skin temperature, and skin sweating volume in a residence, when people are wearing normal clothes and working quietly or moderately. The range of changes in heat dissipation, warmth sensation and other relevant physiological indicators (respiration, pulse, etc.) does not exceed the normal limit. Therefore, various factors of residential microclimate must be maintained within a certain range and remain relatively stable in time and space.
In addition to room temperature, the tactile temperature of building materials cannot be ignored
In cold weather, if our skin comes into contact with the cold tiles in the bathroom, our bodies will Feeling shuddering and having a feeling of cringing. People's feelings of hot and cold are largely controlled by skin temperature. Inside the house, there are many places where skin comes into regular contact. What materials are used in these areas so as not to cause discomfort when it is cold should be taken seriously. Someone measured the temperature drop between the soles of feet and floor coverings. When the ground temperature is 20°C, if it is a wooden floor, the temperature of the soles of the feet will drop by 1°C. Because the materials are different, the degree of temperature drop is also different. According to experimental results and daily life experience, people will feel deeply comfortable only when the ground is a wooden floor and the surface temperature is 17-18. In other words, if the instantaneous drop in temperature of the soles of the feet can be within 1, this is suitable for people. Therefore, if people often touch their skin in places at home, they should choose materials that feel good to the body. Because of this, in modern times when various building materials flood the market, people still like to use wood to make furniture, floors, dados, stairs, doors and windows, etc.