Horsepower
Definitions
The following definitions have been or are widely used: In certain situations it is necessary to distinguish between the various definitions of horsepower and thus a suffix is added: hp(I) for mechanical (or imperial) horsepower, hp(M) for metric horsepower, hp(S) for boiler (or steam) horsepower and hp(E) for electrical horsepower.

Horsepower

Section Title: Definitions
Table Section Text: The following definitions have been or are widely used: In certain situations it is necessary to distinguish between the various definitions of horsepower and thus a suffix is added: hp(I) for mechanical (or imperial) horsepower, hp(M) for metric horsepower, hp(S) for boiler (or steam) horsepower and hp(E) for electrical horsepower.

Mechanical horsepower hp(I)	≡ 33,000 ft lbf/min = 550 ft⋅lbf/s ≈ 17696 lb⋅ft2/s3 = 745.69987158227022 W ≈ 76.04 kgf⋅m/s ≈ 76.04 kg ⋅ 9.80665 m/s2 ⋅ 1 m/s

Metric horsepower hp(M) – also PS, cv, hk, pk, ks or ch	≡ 75 kgf⋅m/s ≡ 75 kg ⋅ 9.80665 m/s2 ⋅ 1 m/s ≡ 735.49875 W ≈ 542.4760388407421 ft⋅lbf/s

Electrical horsepower hp(E)	≡ 746 W

Boiler horsepower hp(S)	≡ 33,475 BTU/h = 9,812.5 W

Hydraulic horsepower	= flow rate (US gal/min) × pressure (psi) × 7/12,000 or = flow rate (US gal/min) × pressure (psi) / 1714 = 550 ft⋅lbf/s = 745.69987158227022 W

Air horsepower	= flow rate ( cubic feet / minute) × pressure (inches water column) / 6,356 or = 550 ft⋅lbf/s = 745.69987158227022 W

Sentence(s)

The boiler horsepower is equal to 33,475 Btu/h.

final_sentence: The boiler horsepower is equal to 33,475 Btu/h.