The measure of how fast the particles in an object are moving is called temperature.

Here's why:

* Temperature is a measure of the average kinetic energy of the particles in a substance. Kinetic energy is the energy of motion. The faster the particles move, the higher their kinetic energy, and therefore, the higher the temperature.

* Heat is the transfer of thermal energy. When heat is added to an object, the particles move faster, increasing the temperature.

* Temperature is measured in degrees Celsius (°C) or Fahrenheit (°F), but the fundamental unit is Kelvin (K).

So, temperature is a direct indicator of how much the particles within an object are jiggling around!