interval scale

An interval scale is a way to measure things where the differences between values are meaningful and precise, but there’s no true zero point. For example, temperature in Celsius or Fahrenheit uses an interval scale—each degree difference is consistent, but 0° doesn’t mean “no temperature.” This scale allows us to compare how much one value differs from another, but it doesn't allow us to say that one value is “twice” another because the zero point is arbitrary. It's useful for measuring things where the exact difference matters, but ratios aren’t meaningful.