An hour is a unit of measurement. A ratio is a comparison of similar things. You can use hours within a ratio showing something over a measurement of time. For example as speed (25 miles/kilometers per hour) or hourly wages ($7.25 per hour).
An hour can also be a measurement of Right Ascension. This is a measure timing the passage of objects in the sky across the meridian as the Earth rotates. RA is measured in hours, minutes, and seconds.
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interval
No, it is nominal.
ratio
Ratio
Only on the Kelvin scale.