Tables（单位转换表）
1 inch（英寸）= 2.540 centimetres = 25.40 millimetres； 1 foot（英尺）= 30.48 centimetres = 0.3048 metre； 1 yard（码）= 91.44 centimetres = 0.9144 metres； 1 mile（英里）= 1609.3 metres = 1.609 kilometres. 1 millimetre（毫米）= 0.039 inch ; 1 centimetre（厘米）= 0.394 inch = 0.033 foot; 1 metre（米）= 3.281 feet = 1.094 yards; 1 kilometre（千米）= 0.621 mile. 1 sq. inch（英寸 2）= 6.45 sq. centimetres; 1 sq. foot（英尺 2）= 929.03 sq. centimetres; 1 sq. yard（码 2）= 0.836 sq. metre; 1 acre（英亩）= 4047 sq. metres = 0.4047 hectare; 1 sq. mile（英里 2）= 2.59 sq. kilometres. 1 sq. centimetre（厘米 2）= 0.155 sq. inch; 1 sq. metre（米 2）= 10.76 sq. feet = 1.196 sq. yards; 1 hectare（公顷）= 2.471 acres; 1 sq. kilometre（千米 2）= 247.1 acres=0.386 e. 1 cu. inch（英寸 ）= 16.383 cu. centimetres; 1 cu. foot（英尺 3）= 0.028 cu. metre; 1 cu. yard（码 3）= 0.765 cu. metre; 1 lmperial gallon（英加仑）= 4546 cu. centimetres; = 1.20 U.S. gallons = 4.55 litres ; 1 U.S. gallon（美加仑）= 0.8333 Imp. gallon = 3785 cu.cm = 3.785 litres. 1 cu. centimetre（厘米 3）= 0.061 cu.inch; 1 cu. metre（米 3）= 35.31 cu. feet = 1.308 cu. yards; 1 litre（升）= 0.2201 Imp. gallon = 0.2642 U.S. gallon; 1 cu. metre = 219.9 Imp. gallons = 264 U.S. gallons.
Mass
质量
Quantity
数量
1 acre-inch（英亩-英寸）= 3630 cu. ft. =111.12 cu. m. = 27,154 Imp. gal. 1 acre-foot（英亩-英尺）= 43，560 cu. ft. = 1233.5 cu.m. = 325,851 Imp. gal. 1 cu. m. = 0.009 acre-inch. = 0.00081 acre-foot.
1 ounce（盎司）= 28.35 grams = 0.028 kilogram; 1 pound（磅）= 453.6 grams = 0.454 kilogram; 1 hundredweight（英担）= 50.80 kilograms; 1 ton（英吨）= 1016 kilograms. 1 gram（克）= 0.035 ounce = 0.0022 pound; 1 kilogram（千克）= 2.205 pounds = 0.00098 ton. 1 cu. ft. Per sec.（英尺 3/秒）= 28.33 litres per sec. 1 cu. ft. per min.（英尺 3/分钟）= 0.472 litres per sec. 1 Imp. gal. Per min.（英加仑/分钟）= 0.076 litres per sec. 1 Imp. gal. Per hr.（英加仑/时）= 0.00455 cu. m. per hr. 1 Imp. gal. Per day（英加仑/日）= 0.00019 cu. m. per hr. = 4.55 litres per day; 1 litre per sec.（升/秒）= 0.353 cu. ft. per sec. = 2.119 cu. ft. per min. 1 cu. m. per sec.（米 3/秒）= 35.32 cu. ft. per sec. = 219.9 Imp. gal. Per sec. = 13,200 Imp. gal. Per min. 1 cu. m. per hr.（米 3/时）= 5,279 Imp. gal. Per day.
Area
面积
Pressure
2
压力
Capacity
体积，容积
1 lb. per sq. in.（磅/英寸 ）= 2.31 ft. head of water = 2.036 in. metcury = 0.068 atmosphere. = 0.0703 kg. Per sq. cm. 1 ft. head of water（英尺水柱）= 0.434 lb. per sq. in. = 0.883 in. mercury = 0.0295 atmosphere. = 0.0345 kg. per sq. cm. 1 in. mercury (英寸汞柱) = 13.56 in.water = 1.133 ft.water = 0.0333 atmosphere = 0.0345 kg. per sq. cm. 1 atmosphere（标准大气压）= 14.71 psi.（磅/英寸 2） = 76 cm. Mercury. = 29.92 in. mercury. = 1.033 kg. per sq. cm. = 33.9 ft. head of water. 1 kg. per sq. cm.（千克/厘米 2）= 0.968 atmosphere. = 29.1 in. mercury. = 14.223 lb. per sq. in. = 32.81 ft. head of water. 1 psi（磅/英寸 2）= 6.895 KPa ; 1 Kilopascal（千帕）= 1000 pascal（帕斯卡）; 1 Bar（巴）= 100 KPa = 14.504 psig. = 1.0197 Kg/c . = 10 metres head of water（水柱）
3
Length
长度
Consumption
消耗量
1 Imp. gal. Per min.（英加仑/分钟）= 0.076 litre per sec. = 4.55 litres per min. 1 million Imp. gal. Per day ( m. g. d. ) （百万英加仑/日） = 4546 cu. m. per day. 1 litre per sec.（升/秒）= 19,016 Imp. gal. Per day. 1 litre per min.（升/分钟）= 316.93 Imp. gal. Per day. 1 cu. m. per day（米 3/日）= 219.9 Imp. gal. Per day.
Rate of flow
流量
Filtration rates
过滤速率
1 ft. per sec.（英尺/秒）= 0.305 m. per sec. 1 in. per min.（英寸/分钟）= 1.524 m. per hr. 1 Imp. gal. Per sq. ft. per min.（英加仑/英尺 2·分钟） = 0.3401 m. per hr. 1 million Imp.gal.per acre per day (百万英加仑/英亩·日) = 0.89 m. per day. 1 m. per sec.（米/秒）= 3.281 ft. per sec. 1 cm. per hr.（厘米/时）= 4.89 Imp. gal. per sq. ft. per hr. 1 m. per hr.（米/时）= 2.946 Imp. gal. per sq. ft. per min. 1 m. per day（米/日）= 1.1736 Imp. gal. per sq. ft. per hr. = 1.1235 m. g. per acre per day.