Final answer:
A scale with a meaningful zero point, representing the absence of the variable being measured, is a ratio scale. The Kelvin temperature scale is an example, with absolute zero as the meaningful zero point.
Step-by-step explanation:
The type of scale that has a meaningful zero point representing a complete absence of the variable being measured is known as a ratio scale. The Kelvin scale is an example of an absolute temperature scale, which uses absolute zero (0 K) as the point of zero kinetic energy of particles, indicating a complete absence of heat. This meaningful zero point allows for the calculation of ratios, making it a true ratio scale. For instance, a temperature of 200 K is twice as hot as 100 K because absolute zero serves as the true zero point.
Another context where a meaningful zero is significant is in null measurements, where the absence of current indicates the core condition being measured. Null measurements can achieve high accuracy because they measure the balance point, or null point, in the circuit.