# Definition:Physical Quantity

## Definition

### Physical Quantity

A physical quantity is a physical property which can be quantified.

### Physical Property

A physical property is any measurable property whose describes the state of a physical system.

### Physical System

A physical system is a portion of the physical universe which has been chosen for investigation for a particular purpose.

### Physical Process

A physical process is a physical system whose importance is in the way it changes over time.

### Measurable Property

A measurable property is a property of a physical system which can be compared against a standard unit of measurement to provide a numerical value defining the quantity of that property.

### Quantitative Property

A quantitative property is a property of a physical system which exists in a range of values corresponding with a number, such that the system can be described as having a particular number of a unit of measurement of that property.