Interval scales and ratio scales are not that different. Interval scales contain a true 0 point but ratio scales don't.

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Quizplus · Accepted Answer

Interval scales do not have a true 0 point, while ratio scales do have a true 0 point. This means that for ratio scales, ratios between values have a meaningful interpretation (e.g. if one value is twice as large as another value, we can say that it is a ratio of 2:1). This is not the case for interval scales, where the absence of a true 0 point means that ratio comparisons are not meaningful.

Interval Scales and Ratio Scales Are Not That Different