Brainstorm: The hotter the weather, the higher the climb.

The earliest thermometer was invented by Italian scientist Galileo (1564 ~ 1642) in 1593. His first thermometer was a glass tube with an opening at one end and a glass bulb the size of a walnut at the other. When in use, the glass bulb is heated first, and then the glass tube is inserted into water.

With the change of temperature, the water surface in the glass tube will move up and down, and the temperature change and temperature level can be judged according to the movement amount. Thermometers expand with heat and contract with cold, so this kind of thermometer is greatly influenced by environmental factors such as external atmospheric pressure, so the measurement error is large.

Extended data

Fahrenheit scale 1

Fahrenheit and Celsius are units used to measure temperature. Many countries in the world, including China, use degrees Celsius, while the United States and some other English-speaking countries use degrees Fahrenheit instead of degrees Celsius.

It is named after its inventor Gabriel D Fahrenheit (1681-1736). Its freezing point is 32°F, and its boiling point is 211.9532 F,/kloc.

The temperature of human body is 100 degree of thermometer. According to the volume expansion distance of mercury, the mercury thermometer is divided into 100 parts from 0 degree to 100 degree, and each part is 1 Fahrenheit, which is recorded as "1 Fahrenheit".

Most countries in the world, including China, use degrees Celsius. Only five countries in the world use Fahrenheit, including Bahamas, Belize, British Cayman Islands, Palau, the United States and other dependencies (Puerto Rico, Guam and the United States Virgin Islands).

2. centigrade scale

Its inventor is anders celsius (1701-1744). Its freezing point is 0℃ and its boiling point is 99.974℃. 1740 Swedes proposed that the temperature of ice-water mixture is 0 degrees Celsius, and the boiling temperature of water is 99.974 degrees at standard atmospheric pressure. According to the two fixed temperature points of water, glass mercury thermometers are graded.

Intercropping between two points is divided into 100 equal parts, and each part is called 1 Celsius. Record as 1℃. Celsius temperature has been incorporated into the international system of units. In physics, the celsius temperature is expressed as t, the absolute temperature (kelvin) is expressed as t, and the celsius temperature is defined as t=T-273. 15. Centigrade is a special name, which replaces Kelvin when it represents the temperature of Centigrade. The numerical value is 1K= 1℃