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Charts & Formulas

Kelvin Scale

Micron

Conversion Factors

To change To Multiply by
acres hectares .4047
acres square feet 43,560
acres square miles .001562
atmospheres cms. of mercury 76
Btu horsepower-hour .0003931
Btu kilowatt-hour .0002928
Btu/hour watts .2931
bushels cubic inches 2150.4
bushels (U.S.) hectoliters .3524
centimeters inches .3937
centimeters feet .03281
cubic feet cubic meters .0283
cubic meters cubic feet 35.3145
cubic meters cubic yards 1.3079
cubic yards cubic meters .7646
degrees radians .01745
dynes grams .00102
fathoms feet 6.0
feet meters .3048
feet miles (nautical) .0001645
feet miles (statute) .0001894
feet/second miles/hour .6818
furlongs feet 660.0
furlongs miles .125
gallons (U.S.) liters 3.7853
grains grams .0648
grams grains 15.4324
grams ounces (avdp) .0353
grams pounds .002205
hectares acres 2.4710
hectoliters bushels (U.S.) 2.8378
horsepower watts 745.7
hours days .04167
inches millimeters 25.4000
inches centimeters 2.5400
kilograms pounds (avdp or troy) 2.2046
kilometers miles .6214
kilowatts horsepower 1.341
knots nautical miles/hour 1.0
knots statute miles/hour 1.151
liters gallons (U.S.) .2642
liters pecks .1135
liters pints (dry) 1.8162
liters pints (liquid) 2.1134
liters quarts (dry) .9081
liters quarts (liquid) 1.0567
meters feet 3.2808
meters miles .0006214
meters yards 1.0936
metric tons tons (long) .9842
metric tons tons (short) 1.1023
miles kilometers 1.6093
miles feet 5280
miles (nautical) miles (statute) 1.1516
miles (statute) miles (nautical) .8684
miles/hour feet/minute 88
millimeters inches .0394
ounces (avdp) grams 28.3495
ounces pounds .0625
ounces (troy) ounces (avdp) 1.09714
pecks liters 8.8096
pints (dry) liters .5506
pints (liquid) liters .4732
pounds (ap or troy) kilograms .3782
pounds (avdp) kilograms .4536
pounds ounces 16
quarts (dry) liters 1.1012
quarts (liquid) liters .9463
radians degrees 57.30
rods meters 5.029
rods feet 16.5
square feet square meters .0929
square kilometers square miles .3861
square meters square feet 10.7639
square meters square yards 1.1960
square miles square kilometers 2.5900
square yards square meters .8361
tons (long) metric tons 1.016
tons (short) metric tons .9072
tons (long) pounds 2240
tons (short) pounds 2000
watts Btu/hour 3.4129
watts horsepower .001341
yards meters .9144
yards miles .0005682

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Fahrenheit and Celsius (Centigrade) Scales

°Celsius °Fahrenheit
–273.15
–459.67
–250
–418
–200
–328
–150
–238
–100
–148
–50
–58
–40
–40
–30
–22
–20
–4
–10
14
0
32
5
41
10
50
15
59
20
68
25
77
30
86
35
95
40
104
45
113
50
122
55
131
60
140
65
149
70
158
75
167
80
176
85
185
90
194
95
203
100
212

Zero on the Fahrenheit scale represents the temperature produced by the mixing of equal weights of snow and common salt.

  °Fahrenheit °Celsius
Boiling point of water  212°  100°
Freezing point of water   32°    0°
Absolute zero –459.6° –273.1°

Absolute zero is theoretically the lowest possible temperature, the point at which all molecular motion would cease.

To convert Fahrenheit to Celsius (Centigrade), subtract 32 and multiply by .6.

To convert Celsius (Centigrade) to Fahrenheit, multiply by 1.8 and add 32.

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Kelvin Scale

Absolute zero, –273.15° on the Celsius (Centigrade) scale, is 0° Kelvin. Thus, Kelvin is equivalent to Celsius plus 273.15. The freezing point of water, 0°C and 32°F, is 273.15°K. The conversion formula is K° = C° + 273.15.

To Convert
To
Multiply by
Cubic Meters Per Hr (m³/hr) Cubic Feet Per Minute (CFM) x 0.588578
Cubic Meters Per Hr (m³/hr) Cubic Feet Per Hour x 35.314
Cubic Meters Per Hr (m³/hr) Liters Per Hour x 1000
Cubic Meters Per Hr (m³/hr) Liters Per Second x 0.277778
Cubic Feet Per Min (CFM) Cubic Meters Per Hour (m³/hr) x 1.6999017
Cubic Feet Per Min (CFM) Liters Per Second x 0.471947
Cubic Feet Per Min (CFM) Liters Per Hour x 1699.017
Cubic Feet Per Min (CFM) Cubic Meters Per Second x 0.000472

How big is a micron?

  • Atmospheric dust < 5 microns
  • One inch contains 25,400 microns
  • Tobacco smoke < 0.5 microns
  • Human hair > 5 microns
  • One millionth of a meter.
  • A micron is very, very, small!

Did you know?

  • A 3mm hole will pass 11 L/S of air at 7 bar - this is equal to 3.5 kW.
  • One 300 m³/h compressor can generate up to 29 liters of water per day.

What is a Dew point?

In simple terms, a dew point describes how much water vapor is present and tells us how cold the compressed air can get before liquid water will form. To prevent water in your air system, choose a dryer that produces a dew point temperature below the lowest possible temperature that downstream air lines and equipment will be exposed to.

Moisture Content At Different Dew points

Dew point
g H²O/m³ Air
Dew point
g H²O/m³ Air
35°C
39.286
5°C
6.790
30°C
30.078
3°C
5.964
25°C
22.386
0°C
4.868
20°C
17.148
-10°C
2.570
15°C
12.739
-20°C
0.88
10°C
9.356
-40°C
0.117
7°C
7.732
-70°C
0.0033

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