21 Gradian = 18.900036 Degree

Capacitance

25 Statfarad

2.782e-11 Farad

statF → F

Weight

99 Stone

628.67871 Kilogram

st → kg

Power

7 Horsepower electric

5,222.00 Watt

hp(E) → W

Angle

81 Second of arc

1.350002 Minute of arc

arcsec → arcmin

Cooking

4 Gallon (US)

15.14164 Liter

gal (US) → L

Pressure

55 Torr

7,332.71 Pascal

Torr → Pa