Equal intervals and an absolute zero point that indicates the absence of the variable being measured are both part of variables.

The concept you're referring to describes "ratio variables."

Ratio variables possess the following characteristics:

1. Equal Intervals: The differences between values are meaningful and consistent. For example, the difference between 10 and 20 is the same interval as the difference between 30 and 40.

2. Absolute Zero: There is a true zero point that indicates the complete absence of the quantity being measured. For instance, a temperature of 0 degrees Kelvin represents an absence of thermal energy, or a weight of 0 kg indicates no mass.

This makes ratio variables not only comparable in terms of size but also allows for meaningful operations such as multiplication and division, enabling us to say that one value is twice as much as another, which isn't possible with interval variables. Examples of ratio variables include height, weight, distance, and temperature in Kelvin.