The degree Celsius or degree Celsius (in symbol in ° C), is the unit of a temperature measurement scale, named after the Swedish astronomer Anders Celsius (1701 - 1744), who proposed it for the first time in 1742.
The Celsius scale fixes the melting point of ice in a mixture of water saturated with air at 0 ° C and the boiling point at 99.974 ° C under standard pressure conditions (1 bar, a little less than one atmosphere, pressure in the one that the water boils at 100 degrees centigrade).
Originally conceived by the Celsius scale had the boiling point of water at…
The Kelvin is the temperature unit of the International System. The Kelvin is one of the seven basic units of temperature. Its symbol in the international system of units is K. The Kelvin scale is a thermodynamic (absolute) temperature scale where the absolute zero, the theoretical absence of energy, is zero (0 K). This unit is named after the British physicist, mathematician and engineer William Thomson (1824 - 1907), who was later named Lord Kelvin. Lord Kelvin wrote about the need for a "thermodynamic temperature scale".
To express the temperature difference or the interval, the use…
Temperature is a physical quantity of matter that expresses quantitatively the common notions of heat and cold. The objects of low temperature are cold, while objects of higher temperatures are considered warm or hot. The temperature is measured quantitatively with thermometers. The thermometers can be calibrated with respect to different temperature scales. Scales to measure temperature
The three most common scales to measure the temperature are:
- The Celsius scale (degrees centigrade)
- The Kelvin scale
- The Fahrenheit scale
The Fahrenheit degree (° F) is a temperature unit proposed by Gabriel Fahrenheit in 1724.
On the Fahrenheit scale, the melting point of water is 32 degrees of temperature, and the boiling point is 212 degrees. A difference of 1.8 degrees Fahrenheit equals that of 1 degree Celsius. Fahrenheit established the zero temperature (0 ° F), the freezing point of a 50% mixture of salt (ammonium chloride) and ice, and as 96 ° F, he took the temperature of the blood (he used that of the horses ). The figure 96 may seem an odd measure, but in principle the scale contained only twelve…
A solar collector of vacuum tubes is a type of solar panel that takes advantage of solar thermal energy. This type of solar panel is formed by linear collectors housed in vacuum glass tubes.
The solar collector of vacuum tubes consists of a set of cylindrical tubes. The tubes are formed by a selective absorber, located on a reflector settlement and surrounded by a transparent glass cylinder.
Between the transparent outer tube and the inner absorber, the vacuum has been made. With this, conduction and convection losses from the absorbent surface are avoided and this fact allows…