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Why is the kelvin scale used rather than the celsius scale?
Because the Kelvin scale is an absolute scale. In the context of thermodynamics, 2 K is twice as "hot" as 1 K. And 3 K is three times as "hot". That is not true of the Celsius or Fahrenheit (or other temperature) scales.
What scale is easier for people to use Fahrenheit or celsius?
Either - it all depends what you learnt when growing up, or have adapted to as you've grown older. The Fahrenheit scale is almost twice the size of the Celsius scale (between freezing and boiling on Celsius there are 100 degrees, but on the Fahrenheit there are 180 degrees) meaning that smaller temperature differences show up as a larger difference with the Fahrenheit scale than with the Celsius scale. They are just as easy as each other, though scientists prefer Kelvin which has the same unit differences as Celsius but starting with 0 K = -273.15oC (water freezes at 273.15 K and boils at 373.15 K). The Fahrenheit scale was originally intended to be 0oF = freezing point of brine, nominally 32oF = freezing point of water and 96oF = normal body temperature, but later scientists redefined the scale slightly so that water did freezer at exactly 32o F which made body temperature 98.4oF.
Why do scientists use the Kelvin and Celsius scale rather than the Fahrenheit scale?
Celsius is a very accurate measurement between the freezing and boiling points of water. 0 being freezing, and 100 boiling. Kelvin is the measurement of absolute zero, where particles stop moving altogether. Kelvin has the same conversion rating, only 0 Kelvin is -273 degrees Celsius. The Kelvin scale is an absolute scale. This means that 2 K is twice as hot as 1 K and so on. Neither the Celsius nor the Fahrenheit scales do that. The Centigrade (or Celsius scale are based on the freezing and boiling points of water (at normal pressure), the Fahrenheit scale was not: the 0 was the lowest temperature attained by ice and salt.
How you can solve the program of temperature in Celsius and convert it into farennite?
This has been answered twice recently: F=1.8 C + 32
What might be the disadvantages of the Celsius and Fahrenheit scales?
Neither of them are absolute scales so that 2 degrees is not twice as warm (hot) as 1 degree. 10 degrees is not ten times as hot as 1 deg.
