21 Revolution per Minute = 0.3500007 Hertz
21 rpm = 0.3500007 Hz
Conversion Formula
1 rpm = 0.0166667 Hz
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Cooking
16 Teaspoon us
78.86272 Milliliter
tsp → ml
Textile
72 Metric count
13.888889 Tex
Nm → tex
Electric charge
29 Faraday
2.798e+6 Coulomb
F → C
Frequency
76 Degree per second
0.21111128 Hertz
°/s → Hz
Volume
80 Quart us
75.70824 Liter
qt (US) → l
Speed
50 Knot
92.599846 Kilometer per Hour
kn → km/h