Technical characteristics, pressure, Liquid Measure Equivalents,

 

Technical characteristics

Pressure Equivalents

English Metric

1psi = 0.068 atmosphere    = . 07031 kg/cm2

=144 lbs./ sq.ft.     = .703 meters water

=2.036 in.of mercury  =70.3 cm water

= 2.307 ft.of water   = 51.7 mm. hg.

= 27.7 in. of water

1 oz./sq.in.

=.138 on. of mercury

= 1.73 in.of water

1 in. of  mercury

=.334 atmosphere =.0345 kg/ cm2

=.491 psi =25.4 mm. hg.

=1.13 ft. of water =. 3453 m. water

=13.6 in. of water

= 70.73 p s f

1 atmosphere

=29.92 in.of mercury  =1.03 kg / cm 2

=33.94 ft.of water =760 mm./hg.

=14.696 psi =10.33 m.water

=2116.35 p s f

1 p s f

=. 007 psi =4.88 × 10. 4 g/cm

= 4.725 × 10.4

atmosphere =.359 mm.hg.

=.01414 in. hg. =.0049 m.water

=.016 ft. water

1 kilogram / sq. cm

=14.22 psi   =10 meters of water

=2048.17 p s f

=. 967 atmosphere

=28.96 in. hg.

=32.8083 inches water

1 meter of water

=1.42 psi =73.55 mm.hg.

=204.8 p s f =.10 kg./ cm2

=.097 atmosphere

=2.896 in. hg.

=3.28 ft. water

1 mm. hg.

=.019 psi =.00136 kg/cm 2

=2.78 p s f  =.0136 m.water

=.001316 atmosphere

=.039 in. h g.

= . 0446 ft. water

Liquid Measure Equivalents

Liquid measure  U.S. Metric

1 pint    =16 ounces   =.473 liters

1 quart =2 pints  =.946 liters

1 quart =32 ounces

1 gallon =4 quarts =3.785 liters

1 gallon  =8 pints

1 gallon  =231 cubic inches

1 cu. ft.  =7.84 gallons

1 gallon  =8.34 pounds of water

 

Heat Transfer Coefficients

  Unit of heat pound centigrade or centigrade heat unit is the heat required to raise one pound of water 1 C. degree and equals 1.8 Btu.

1 Btu/hr./sq.ft./F. = 4.88 kg-ca./hr./sq.m./C.

1 kg-cal./hr./sq.m./C.=. 205 Btu/hr./sq.ft./F.

Heat Coefficients

1 Btu = 252 calories

1 kilocalorie = 1000 calories

1 Btu/lb. =. 555 kcal/kg

1 kcal / kg = 1.8 Btu/lb.

Energy Coversion Equivalents

1 Btu = 778 ft. lbs.

1 Horsepower

= 33,000 ft.lb./min.

= 550 ft.lb/sec.

= 746 watts

= 2545.6 Btu / hr.

= 42.42 Btu/ min.

1 Horsepower hour

= 1 horsepower for 1 hr.

= 1,980,000 ft.lb.

= 746 kilowatt hours

= 2545.6 Btu

1 kilowatt

= 1,000 watts

= 1.34 horsepower

1 kilowatt hour

= 1 kilowatt for 1 hr.

= 1,000 watt hours

Ice Melting Effect (ime)

1 ton of Refrigeration 

= 288,000 Btu/day

= 12,000 Btu/hr.

= 200 Btu/min.

= 83.3 lbs. of ice/ hr.

Energy

1 dyne cm 

= 1 erg

=. 001 g. cm

= 7.38×10.8 ft.lb.

1 g.cm

= 980.6 ergs

= 7.233 × 10.5 ft. lb.

1 ft. lb.

= 13,557,300 ergs

= 13,825.5 g.cm

1 therm 

= 100,000 Btu

Rate of Energy

1 erg/sec.

= 1 dyne cm

= 7.38 × 10.8 ft. lb./sec.

1 gram.cm

= 980.6 ergs/sec. 

= 7.24 × 10.5 ft. lb./sec.

1 ft.lb./sec.

= 13,557,300 ergs/sec.

= 13,800 grams cm/sec.