Btu / scf = Btu / lb X MW / 379.5
where:
MW = molecular weight of the gas, lb / lb-mol
The constant 379.5 is the molar volume at standard conditions of 14.696 psia and 60°F
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1 pound = 0.45359237 kilograms
Probably simplest (easiest not to get mixed up) to convert both to lb, subtract, then convert back to tons. 1 ton = 2000 lb, so: 6t 300 lb = 6x2000 lb + 300 lb = 12000 lb + 300 lb = 12300 lb 2t 900 lb = 2x2000 lb + 900 lb = 4000 lb + 900 lb = 4900 lb 12300 lb - 4900 lb = 7400 lb convert back to tons: 7400 lb/ 2000 lb per ton = 3 tons 1400 lb
3.99$/1lb * 1lb/0.453 kg = 8.80$/kg
Multiply the $50 by 2.2.... $50 per lb = $110 per kilo
A US gallon of water is about 8.4 lb, so 30,000 galls is 252,000 lb. One BTU is the heat to raise one pound of water by one degF, so BTU's in your example are 252,000 x 15 = 3,780,000 BTU.