why is Kelvin considered as the best scale for measuring the temperature
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Kelvin is considered to be the best scale for measuring temperature for two reasons:
1, Because the Kelvin scale defines what we mean by temperature. Other scales are now defined in terms of the Kelvin scale.
2, Because some important changes such as the pressure or volume of a gas increase proportional to the Kelvin scale. E.g if we have a gas at 100 K and the temperature is increased to 120 K, then in a fixed volume the pressure will increase by 20%. (To a first approximation, which is often good enough.)
Temperature used to be fairly arbitrary, depending on what thermometer you were using, by what manufacturer and what the working principle was. (For example, expansion of different liquids, change in electrical resistance.) Even today if you have two different thermometers which have been calibrated to agree at 0 and 100 °C, they may disagree at around 50 °C, because of the slightly different linearity.
Kelvin suggested a definition of temperature based on thermodynamics, which has been adopted as the definition of temperature. This definition means that there is an absolute zero. It was decided that it would be convenient for the units to be the same size as the commonly used Celsius scale, and it was later decided to call these units “degrees Kelvin”, which meant that the triple point of water was 273.16 °K. (This is the only temperature at which water exists simultaneously in three phases. The melting point changes with high pressures.) It was later decided that to harmonize with other units, the degree symbol would be dropped, and the unit called the kelvin. (Note units named after people have symbols with a capital letter, but the name of the unit does not, to distinguish it from the person.)
Under ordinary conditions, ice melts at 273.15, so the Celsius scale is now defined as the number of kelvins above this value. Fahrenheit is also defined in a similar way, with its degrees being a fixed fraction of a kelvin. Taking the Fahrenheit scale down to absolute zero gives -459.67 °F. For the convenience of American engineers a thermodynamic scale in degrees exactly the same as °F is the Rankine scale, thus 0 °F is 459.67 °R, and it can be used for the pressure calculation above in exactly the same way. However, it is little used today, since most scientists and engineers use the international standard of the Kelvin scale.
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_____________________________
Kelvin is considered to be the best scale for measuring temperature for two reasons:
1, Because the Kelvin scale defines what we mean by temperature. Other scales are now defined in terms of the Kelvin scale.
2, Because some important changes such as the pressure or volume of a gas increase proportional to the Kelvin scale. E.g if we have a gas at 100 K and the temperature is increased to 120 K, then in a fixed volume the pressure will increase by 20%. (To a first approximation, which is often good enough.)
Temperature used to be fairly arbitrary, depending on what thermometer you were using, by what manufacturer and what the working principle was. (For example, expansion of different liquids, change in electrical resistance.) Even today if you have two different thermometers which have been calibrated to agree at 0 and 100 °C, they may disagree at around 50 °C, because of the slightly different linearity.
Kelvin suggested a definition of temperature based on thermodynamics, which has been adopted as the definition of temperature. This definition means that there is an absolute zero. It was decided that it would be convenient for the units to be the same size as the commonly used Celsius scale, and it was later decided to call these units “degrees Kelvin”, which meant that the triple point of water was 273.16 °K. (This is the only temperature at which water exists simultaneously in three phases. The melting point changes with high pressures.) It was later decided that to harmonize with other units, the degree symbol would be dropped, and the unit called the kelvin. (Note units named after people have symbols with a capital letter, but the name of the unit does not, to distinguish it from the person.)
Under ordinary conditions, ice melts at 273.15, so the Celsius scale is now defined as the number of kelvins above this value. Fahrenheit is also defined in a similar way, with its degrees being a fixed fraction of a kelvin. Taking the Fahrenheit scale down to absolute zero gives -459.67 °F. For the convenience of American engineers a thermodynamic scale in degrees exactly the same as °F is the Rankine scale, thus 0 °F is 459.67 °R, and it can be used for the pressure calculation above in exactly the same way. However, it is little used today, since most scientists and engineers use the international standard of the Kelvin scale.
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Kelvin is considered as the best scale for the measurement of temperature because it has no maximum temperature.
- A Kelvin is the best measurement scale as it can record temperature upto any level and does not have any maximum temperature.
- Since the Kelvin scale determines what temperature means to us.
- For example, if we have a temperature at 100 K and the temperature rises to 115 K, then the pressure rises by 15% in a fixed volume
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