The concept of temperature and temperature measurement

The concept of temperature in daily life, we are used to distinguish objects with feeling of hot and cold, with the hand touch feel ice is cold, hot kettle fingered felt it was very hot. Ice cold illustrates its low temperature, hot hot show its high temperature of the kettle. For the concept of temperature, we can simply understood as the temperature is hot and cold said object level of physical quantities. From the kinetic theory, we know the temperature of the object associated with the speed of a large number of random movement of molecules. When the object's temperature, the speed of molecular motion is accelerated, on the other hand, if we are not in some way to speed the speed, then the temperature of the objects to rise. Thus we can understand, hot water temperature is high, the water temperature is low, because of their different molecular movement speed, molecular movement speed determines the thermal state of the object. So we put a lot of random movement of molecules is called thermal motion. Temperature measuring how we distinguish the temperature of an object? The feeling of choose and employ persons to temperature is actually not accurate. Rather cold in winter, for example, a man walked into the room from the outside, and feel the room is very warm, another person from a hotter place into the room, but feel that this room is very cold. Also a pot of cold water, hot and cold different two hands in, feel the water in the basin hot and cold are different. So to measure temperature accurately, must use the thermometer. The thermometer, we use is the freezing point of pure water as 0 & ordm; C。 The boiling water temperature as a pressure l00 & ordm; C。 In 0 & ordm; C and 100 & ordm; Between C is divided into 100 equal parts, each is 1 & ordm; C, this kind of method to determine the scale is called the Celsius scale, the Celsius scale is Swedish astronomer, hughes, in 1742, so it was generally supposed that the Celsius scale mark & other; º C” 'English' is taken, Theseus. In addition to the Celsius scale, in Europe and the United States and other countries also USES the Fahrenheit scale, with & other; º F” Said the Fahrenheit scale to the freezing point of water is 32 & ordm; F, the boiling point of water at 212 & ordm; F, in 32 & ordm; And 212 F & ordm; F between divided into 180 equal parts, each is 1 & ordm; F。 Commonly used in thermodynamics, the absolute scale, the unit is on ( Irvine) Symbol for & ordm; K, it is to the freezing point of water at 273. 15º K, the boiling point at 373. 15º K, the conversion often omit zero. 15º K, only 273 & ordm; K。 Thermodynamic temperature conversion relation of K and the Celsius temperature are as follows: K = & ordm; C+273 º C = k - 273