How is energy quantified in the SI unit system?

In the SI unit system, energy is quantified in Joules. One Joule is defined as the amount of energy transferred when a force of one Newton acts over a distance of one meter. This relationship highlights the foundational definitions in physics where energy, force, and distance are interconnected.

Joules can be related to various forms of energy, such as kinetic energy, potential energy, and thermal energy, making it a versatile unit. It is essential for understanding energy transfer processes in different physical contexts, from simple mechanical systems to complex thermodynamic processes.

The other units listed—Watt, Newton, and Pascal—measure different physical quantities. The Watt is a unit of power, which is the rate at which energy is used or produced (1 Watt equals 1 Joule per second). The Newton is a unit of force, defined as the force required to accelerate one kilogram of mass at a rate of one meter per second squared. The Pascal is a unit of pressure, defined as one Newton per square meter. Each of these units has its specific application and meaning within physics, but they do not represent energy quantification as the Joule does.