Читать книгу Steam, Its Generation and Use - Babcock Wilcox Company - Страница 27

+—————————————+—————+—————+ | Temperature Degrees |Weight per|Weight per| | Fahrenheit |Cubic Foot|Cubic Inch| | | Pounds | Pounds | +—————————————+—————+—————+ |At 32 degrees or freezing | | | | point at sea level | 62.418 | 0.03612 | |At 39.2 degrees or point of| | | | maximum density | 62.427 | 0.03613 | |At 62 degrees or standard | | | | temperature | 62.355 | 0.03608 | |At 212 degrees or boiling | | | | point at sea level | 59.846 | 0.03469 | +—————————————+—————+—————+

While authorities differ as to the weight of water, the range of values given for 62 degrees Fahrenheit (the standard temperature ordinarily taken) being from 62.291 pounds to 62.360 pounds per cubic foot, the value 62.355 is generally accepted as the most accurate.

A United States standard gallon holds 231 cubic inches and weighs, at 62 degrees Fahrenheit, approximately 8–⅓ pounds.

A British Imperial gallon holds 277.42 cubic inches and weighs, at 62 degrees Fahrenheit, 10 pounds.

The above are the true weights corrected for the effect of the buoyancy of the air, or the weight in vacuo. If water is weighed in air in the ordinary way, there is a correction of about one-eighth of one per cent which is usually negligible.