Thousand per hour

The symbol mi/h indicates the unit of Speed used in atmospheric Météorologie, the international mile by hour.

It is also used as measuring unit speed on road, and indicates then the terrestrial mile per hour with the the United States. This unit is often used in the Anglo-Saxon countries under the name (English) mile per hour (shortened then mph ).

There exists then often in the American public a confusion between the old unit terrestrial speed (based on a definition slightly different from the mile for the measurement of the distances, abolished but still of use in the United States), the scientific unit (using the definition of thousand international to measure the speed of the winds and the intensity of the Tempête S and hurricanes), and the maritime unit (based on the nautical thousand also used in aeronautics, but the name thousand per hour is seldom used for speed because one prefers then to him the name of node).

One thus should not confuse this unit with the node ( knot in English, often shortened NM/h or sometimes kt or Nd in French), usual name given to the nautical thousand ( nautic mile , shortened Nm ) per hour, and at sea indicates a speed of navigation or in aeronautics.

Also one will prefer the international unit speed km/h (Kilomètre per hour) or m/s to him (Mètre by second) if that simplifies calculations of forces, powers and energies), because of the ambiguity of the definition of the thousand ( mile ) between various countries or uses, or even through the history of the same country.

1 mi/h equal:

0,44704 m/s (meter a second), the unit derived from the international Système (IF);
1,609344 km/h (kilometer per hour);
22/15 ≈ 1,4667 Ft/s (foot a second);
≈ 0,868976 NM/h (node).

Simple: Miles per hour

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