91Ó°ÊÓ

First and foremost, comprehend the basic information about each temperature scale\n- Kelvin (K): This is the SI unit for temperature. Its null point (0 K) is defined as absolute zero, and each unit represents the same temperature increase as 1 degree Celsius.\n- Celsius (°C): This is used in most of the world for everyday temperature measurements. It is defined based on the freezing point (0 °C) and boiling point (100 °C) of water (at 1 ATM).\n- Fahrenheit (°F): This is used in the United States for non-scientific temperature measurements. It defines the freezing point of water as 32 °F and the boiling point as 212 °F.\n- Rankine (°R): This scale starts at absolute zero, like Kelvin, but uses Fahrenheit degree increments. (0 °R = absolute zero)

For the same increase in temperature: \n- A change of 1 K equals a change of 1 °C \n- A change of 1.8 °F equals a change of 1 °C \n- A change of 1.8 °R equals a change of 1 K (and hence 1 °C)

From steps 1 and 2, when comparing the relative sizes of the kelvin, degree Celsius, degree Fahrenheit, and degree Rankine, the conclusion is that 1 K = 1 °C < 1.8 °F = 1.8 °R in terms of temperature increments (or size of the unit).