Which of the following is considered a base unit of temperature?

The base unit of temperature in the International System of Units (SI) is the Kelvin. This unit is defined based on the absolute temperature scale, which is essential in scientific measurements and calculations. The Kelvin scale is particularly important in fields such as physics, chemistry, and engineering because it starts from absolute zero, the point at which all thermal motion ceases.

Choosing Kelvin over the other options is appropriate because:

• The Joule is a unit of energy, used to measure work done or heat energy.
• The Pascal is a unit of pressure, which quantifies internal pressure, stress, or tension.
• The Mole is a unit used to express amounts of a substance, particularly in chemistry, representing a specific quantity of particles like atoms or molecules.

Thus, among the given choices, the Kelvin uniquely serves as the standard for measuring temperature, making it the correct answer.