What is the difference between data measured on a ratio scale, and data measured on an interval scale?

A ratio scale puts scores into categories, while an interval scale measures on a continuous scale.

A ratio scale has equal intervals between the points on the scale, whereas an interval scale does not.

An interval scale has a true zero point, so zero on the scale corresponds to zero of the concept being measured.

A ratio scale has a true zero point, so zero on the scale corresponds to zero of the concept being measured.