Operational Definition: Growth rate could be calculated by measuring the increase in population, revenue, or size over a set period of time, such as annually.

Operational Definition: Temperature can be defined as the reading on a thermometer or the value recorded by a digital temperature sensor.

Operational Definition: Volume can be observed when water is poured into a graduated cylinder, as the rise in liquid level represents the space it occupies.

Operational Definition: Pressure is demonstrated when a balloon inflates. As air enters, gas molecules collide with the inner walls, expanding the balloon and showing how pressure acts in an enclosed space.