What is the difference in units between Kelvin and centigrade scales of temperature?

273.15

The correct answer is option 4. 273.15.

The Kelvin (K) and Celsius (°C) scales are two commonly used temperature scales. The Kelvin scale is an absolute temperature scale, and the Celsius scale is a relative temperature scale. The difference in units between these two scales is based on their respective zero points and their definitions:

1. Celsius (Centigrade) Scale:

Zero degrees Celsius (0°C) is defined as the freezing point of water.

One degree Celsius (1°C) is the temperature difference equivalent to one Kelvin (1 K).

The Celsius scale is relative to the freezing point and boiling point of water under standard atmospheric pressure.

2. Kelvin Scale:

The Kelvin scale is an absolute temperature scale with zero Kelvin (0 K) defined as absolute zero, the lowest possible temperature where molecular motion ceases.

The Kelvin is the same size as the Celsius degree; however, the Kelvin scale does not use the degree symbol.

The conversion from Celsius to Kelvin involves adding 273.15 to the Celsius temperature.

Therefore, to convert a temperature from Celsius to Kelvin, you add 273.15. The difference in units between the Kelvin and Celsius scales is precisely 273.15. For example, 0°C is equivalent to 273.15 K, and 100°C is equivalent to 373.15 K.