Nhờ các bạn giúp đở

Hi, chào các bạn trên diễn đàn!

Hiện tạ mình đang gặp khó khăn vơi một số kí hiệu đơn vị, tìm mãi trên mạng mà không thấy, bạn nào biết giúp đở mình vời nha.

Các đơn vị lưu lưong:

K.kg/h

sm3/h

BAOSON_H5' post='16604' date='Apr 23 2009, 09:55 AM' viết:Hi, chào các bạn trên diễn đàn!

Hiện tạ mình đang gặp khó khăn vơi một số kí hiệu đơn vị, tìm mãi trên mạng mà không thấy, bạn nào biết giúp đở mình vời nha.

Các đơn vị lưu lưong:

K.kg/h

sm3/h

K : Kilo -> K.kg/h là 1000kg/h hay ton/h

S : Standard ->Sm3/h là standard m3/h. Còn standard là gì thì xem 🔒 Bấm Cảm ơn hoặc Trả lời để xem Link.

Tốt nhất là xem định nghĩa đi kèm sách bạn đọc về standard vì mỗi tiêu chuẩn mỗi khác.

Thân,

Rất cảm ơn anh Calimodo.

(Đây là một số đơn vị sử dụng trong nhà đánh giá vận hành nhà máy xử lý khí Dinh Cố nên không có tiêu chuẩn đi kèm. )

Conversion formulae for temperature

• [sup]o[/sup]F = ([sup]o[/sup]C)(9/5) + 32

• oC = (oF - 32)(5/9)

• oR = oF + 459.67

• K = oC + 273.15

Conversion factors for distance

1 inch (in) = 2.540000 centimeter (cm)

1 foot (ft) = 12 inches (in)

1 yard (yd) = 3 feet (ft)

1 mile (mi) = 5280 feet (ft)

Conversion factors for volume

1 gallon (gal) = 231.0 cubic inches (in3) = 4 quarts (qt) = 8 pints (pt) = 128 fluid ounces (fl. oz.)

= 3.7854 liters (l)

1 milliliter (ml) = 1 cubic centimeter (cm3)

Conversion factors for velocity

1 mile per hour (mi/h) = 88 feet per minute (ft/m) = 1.46667 feet per second (ft/s) = 1.60934

kilometer per hour (km/h) = 0.44704 meter per second (m/s) = 0.868976 knot (knot – international)

Conversion factors for mass

1 pound (lbm) = 0.45359 kilogram (kg) = 0.031081 slugs

Conversion factors for force

1 pound-force (lbf) = 4.44822 newton (N)

Conversion factors for area

1 acre = 43560 square feet (ft2) = 4840 square yards (yd2) = 4046.86 square meters (m2)

Conversion factors for pressure (either all gauge or all absolute)

1 pound per square inch (PSI) = 2.03603 inches of mercury (in. Hg) = 27.6807 inches of water (in.

W.C.) = 6.894757 kilo-pascals (kPa)

Conversion factors for pressure (absolute pressure units only)

1 atmosphere (Atm) = 14.7 pounds per square inch absolute (PSIA) = 760 millimeters of mercury

absolute (mmHgA) = 760 torr (torr) = 1.01325 bar (bar)

Conversion factors for energy or work

1 British thermal unit (Btu – “International Table”) = 251.996 calories (cal – “International Table”)

= 1055.06 joules (J) = 1055.06 watt-seconds (W-s) = 0.293071 watt-hour (W-hr) = 1.05506 x 1010

ergs (erg) = 778.169 foot-pound-force (ft-lbf)

Conversion factors for power

1 horsepower (hp – 550 ft-lbf/s) = 745.7 watts (W) = 2544.43 British thermal units per hour

(Btu/hr) = 🔒 Bấm Cảm ơn hoặc Trả lời để xem SĐT/Liên hệ boiler horsepower (hp – boiler)

Terrestrial constants

Acceleration of gravity at sea level = 9.806650 meters per second per second (m/s2) = 32.1740 feet

per second per second (ft/s2)

Atmospheric pressure = 14.7 pounds per square inch absolute (PSIA) = 760 millimeters of mercury

absolute (mmHgA) = 760 torr (torr) = 1.01325 bar (bar)

Atmospheric gas concentrations:

• Nitrogen = 78.084 %

• Oxygen = 20.946 %

• Argon = 0.934 %

• Carbon Dioxide (CO2) = 0.033 %

• Neon = 18.18 ppm

• Helium = 5.24 ppm

• Methane (CH4) = 2 ppm

• Krypton = 1.14 ppm

• Hydrogen = 0.5 ppm

• Nitrous Oxide (N2O) = 0.5 ppm

• Xenon = 0.087 ppm

Density of dry air at 20oC and 760 torr = 1.204 mg/cm3 = 1.204 kg/m3 = 0.075 lb/ft3 = 0.00235

slugs/ft3

Absolute viscosity of dry air at 20oC and 760 torr = 0.018 centipoise (cp) = 1.8 × 10−5 Pascal-

seconds (Pa
s)

Properties of water

Freezing point at sea level = 32oF = 0oC

Boiling point at sea level = 212oF = 100oC

Density of water at 4oC = 1000 kg/m3 = 1 g/cm3 = 1 kg/liter = 62.428 lb/ft3 = 1.951 slugs/ft3

Specific heat of water at 14oC = 1.00002 calories/g


oC = 1 BTU/lb


oF = 4.1869 joules/g


oC

Specific heat of ice ≈ 0.5 calories/g


oC

Specific heat of steam ≈ 0.48 calories/g


oC

Absolute viscosity of water at 20oC = 1.0019 centipoise (cp) = 🔒 Bấm Cảm ơn hoặc Trả lời để xem SĐT/Liên hệ Pascal-seconds (Pa
s)

Surface tension of water (in contact with air) at 18oC = 73.05 dynes/cm

pH of pure water at 25o C = 7.0 (pH scale = 0 to 14 )

Miscellaneous physical constants

Speed of light in a vacuum © = 2.9979 × 108 meters per second (m/s) = 186,281 miles per second

(mi/s)

Avogadro’s number (NA) = 6.0220 × 1023 per mole (mol

−1)

Electronic charge (e) = 1.6022 × 10−19 Coulomb ©

Faraday constant (F) = 9.6485 × 104 Coulombs per mole (C/mol)

Boltzmann’s constant (k) = 1.3807 × 10−23 joules per Kelvin (J/K)

Stefan-Boltzmann constant (σ) = 5.6703 × 10−8 Watts per square meter-Kelvin4 (W/m2
K4)

Molar gas constant ® = 8.3144 joules per mole-Kelvin (J/mol-K)

Note: all physical constants listed here were derived (rounded to the fifth significant digit) from

values given on page F-198 of the CRC Handbook of Chemistry and Physics, 64th edition.

Weight densities of common materials

All density figures approximate for samples at standard temperature and pressure2.

Liquids:

• Acetone: γ = 49.4 lb/ft3

• Alcohol, ethyl (ethanol): γ = 49.4 lb/ft3

• Alcohol, methyl (methanol): γ = 50.5 lb/ft3

• Benzene: γ = 56.1 lb/ft3

• Butane (liquid): γ = 36.1 lb/ft3

• Carbon disulfide: γ = 80.7 lb/ft3

• Carbon tetrachloride: γ = 99.6 lb/ft3

• Chloroform: γ = 93 lb/ft3

• Ethylene glycol (ethanediol): γ = 69.22 lb/ft3

• Gasoline: γ = 41 lb/ft3 to 43 lb/ft3

• Glycerin: γ = 78.6 lb/ft3

• Isobutane (liquid): γ = 34.8 lb/ft3

• Kerosene: γ = 51.2 lb/ft3

• Mercury: γ = 849 lb/ft3

• Methanol (methyl alcohol): γ = 50.5 lb/ft3

• Milk: γ = 64.2 lb/ft3 to 64.6 lb/ft3

• Naphtha, petroleum: γ = 41.5 lb/ft3

• Oil, castor: γ = 60.5 lb/ft3

• Oil, coconut: γ = 57.7 lb/ft3

• Oil, linseed (boiled): γ = 58.8 lb/ft3

• Oil, olive: γ = 57.3 lb/ft3

• Propane (liquid): γ = 31.2 lb/ft3

• Toluene: γ = 54.1 lb/ft3

2Density figures taken or derived from tables in the CRC Handbook of Chemistry and Physics, 64th Edition. Most

liquid densities taken from table on page F-3 and solid densities taken from table on page F-1. Some liquid densities

taken from tables on pages E-27 through E-31. All temperatures at or near 20oC.

• Turpentine: γ = 54.3 lb/ft3

• Water, heavy: γ = 68.97 lb/ft3

• Water, light (normal): γ = 62.4 lb/ft3

• Water, sea: γ = 63.99 lb/ft3

Solids:

• Beryllium: γ = 115.37 lb/ft3

• Brass: γ = 524.4 lb/ft3

• Calcium: γ = 96.763 lb/ft3

• Carbon (diamond): γ = 196.65 lb/ft3 to 220.37 lb/ft3

• Cement (set): γ = 170 lb/ft3 to 190 lb/ft3

• Chromium: γ = 448.86 lb/ft3

• Copper: γ = 559.36 lb/ft3

• Cork: γ = 14 lb/ft3 to 16 lb/ft3

• Gold: γ = 1178.6 lb/ft3

• Ice: γ = 57.2 lb/ft3

• Iron: γ = 490.68 lb/ft3

• Ivory: γ = 114 lb/ft3 to 120 lb/ft3

• Lead: γ = 708.56 lb/ft3

• Leather: γ = 54 lb/ft3

• Magnesium: γ = 108.50 lb/ft3

• Molybdenum: γ = 638.01 lb/ft3

• Quartz: γ = 165 lb/ft3

• Rubber (soft): γ = 69 lb/ft3

• Rubber (hard): γ = 74 lb/ft3

• Salt, rock: γ = 136 lb/ft3

• Sugar: γ = 99 lb/ft3

• Tar: γ = 66 lb/ft3

• Wood, balsa: γ = 7 lb/ft3 to 9 lb/ft3

• Wood, maple: γ = 39 lb/ft3 to 47 lb/ft3

U can use the Babylon-Pro-Dict. conversion

hnhanchinh' post='16616' date='Apr 24 2009, 11:26 AM' viết:Conversion formulae for temperature

• [sup]o[/sup]F = ([sup]o[/sup]C)(9/5) + 32

• oC = (oF - 32)(5/9)

• oR = oF + 459.67

• K = oC + 273.15

Conversion factors for distance

1 inch (in) = 2.540000 centimeter (cm)

1 foot (ft) = 12 inches (in)

1 yard (yd) = 3 feet (ft)

1 mile (mi) = 5280 feet (ft)

Conversion factors for volume

1 gallon (gal) = 231.0 cubic inches (in3) = 4 quarts (qt) = 8 pints (pt) = 128 fluid ounces (fl. oz.)

= 3.7854 liters (l)

1 milliliter (ml) = 1 cubic centimeter (cm3)

Conversion factors for velocity

1 mile per hour (mi/h) = 88 feet per minute (ft/m) = 1.46667 feet per second (ft/s) = 1.60934

kilometer per hour (km/h) = 0.44704 meter per second (m/s) = 0.868976 knot (knot – international)

Conversion factors for mass

1 pound (lbm) = 0.45359 kilogram (kg) = 0.031081 slugs

Conversion factors for force

1 pound-force (lbf) = 4.44822 newton (N)

Conversion factors for area

1 acre = 43560 square feet (ft2) = 4840 square yards (yd2) = 4046.86 square meters (m2)

Conversion factors for pressure (either all gauge or all absolute)

1 pound per square inch (PSI) = 2.03603 inches of mercury (in. Hg) = 27.6807 inches of water (in.

W.C.) = 6.894757 kilo-pascals (kPa)

Conversion factors for pressure (absolute pressure units only)

1 atmosphere (Atm) = 14.7 pounds per square inch absolute (PSIA) = 760 millimeters of mercury

absolute (mmHgA) = 760 torr (torr) = 1.01325 bar (bar)

Conversion factors for energy or work

1 British thermal unit (Btu – “International Table”) = 251.996 calories (cal – “International Table”)

= 1055.06 joules (J) = 1055.06 watt-seconds (W-s) = 0.293071 watt-hour (W-hr) = 1.05506 x 1010

ergs (erg) = 778.169 foot-pound-force (ft-lbf)

Conversion factors for power

1 horsepower (hp – 550 ft-lbf/s) = 745.7 watts (W) = 2544.43 British thermal units per hour

(Btu/hr) = 🔒 Bấm Cảm ơn hoặc Trả lời để xem SĐT/Liên hệ boiler horsepower (hp – boiler)

Terrestrial constants

Acceleration of gravity at sea level = 9.806650 meters per second per second (m/s2) = 32.1740 feet

per second per second (ft/s2)

Atmospheric pressure = 14.7 pounds per square inch absolute (PSIA) = 760 millimeters of mercury

absolute (mmHgA) = 760 torr (torr) = 1.01325 bar (bar)

Atmospheric gas concentrations:

• Nitrogen = 78.084 %

• Oxygen = 20.946 %

• Argon = 0.934 %

• Carbon Dioxide (CO2) = 0.033 %

• Neon = 18.18 ppm

• Helium = 5.24 ppm

• Methane (CH4) = 2 ppm

• Krypton = 1.14 ppm

• Hydrogen = 0.5 ppm

• Nitrous Oxide (N2O) = 0.5 ppm

• Xenon = 0.087 ppm

Density of dry air at 20oC and 760 torr = 1.204 mg/cm3 = 1.204 kg/m3 = 0.075 lb/ft3 = 0.00235

slugs/ft3

Absolute viscosity of dry air at 20oC and 760 torr = 0.018 centipoise (cp) = 1.8 × 10−5 Pascal-

seconds (Pa
s)

Properties of water

Freezing point at sea level = 32oF = 0oC

Boiling point at sea level = 212oF = 100oC

Density of water at 4oC = 1000 kg/m3 = 1 g/cm3 = 1 kg/liter = 62.428 lb/ft3 = 1.951 slugs/ft3

Specific heat of water at 14oC = 1.00002 calories/g


oC = 1 BTU/lb


oF = 4.1869 joules/g


oC

Specific heat of ice ≈ 0.5 calories/g


oC

Specific heat of steam ≈ 0.48 calories/g


oC

Absolute viscosity of water at 20oC = 1.0019 centipoise (cp) = 🔒 Bấm Cảm ơn hoặc Trả lời để xem SĐT/Liên hệ Pascal-seconds (Pa
s)

Surface tension of water (in contact with air) at 18oC = 73.05 dynes/cm

pH of pure water at 25o C = 7.0 (pH scale = 0 to 14 )

Miscellaneous physical constants

Speed of light in a vacuum © = 2.9979 × 108 meters per second (m/s) = 186,281 miles per second

(mi/s)

Avogadro’s number (NA) = 6.0220 × 1023 per mole (mol

−1)

Electronic charge (e) = 1.6022 × 10−19 Coulomb ©

Faraday constant (F) = 9.6485 × 104 Coulombs per mole (C/mol)

Boltzmann’s constant (k) = 1.3807 × 10−23 joules per Kelvin (J/K)

Stefan-Boltzmann constant (σ) = 5.6703 × 10−8 Watts per square meter-Kelvin4 (W/m2
K4)

Molar gas constant ® = 8.3144 joules per mole-Kelvin (J/mol-K)

Note: all physical constants listed here were derived (rounded to the fifth significant digit) from

values given on page F-198 of the CRC Handbook of Chemistry and Physics, 64th edition.

Weight densities of common materials

All density figures approximate for samples at standard temperature and pressure2.

Liquids:

• Acetone: γ = 49.4 lb/ft3

• Alcohol, ethyl (ethanol): γ = 49.4 lb/ft3

• Alcohol, methyl (methanol): γ = 50.5 lb/ft3

• Benzene: γ = 56.1 lb/ft3

• Butane (liquid): γ = 36.1 lb/ft3

• Carbon disulfide: γ = 80.7 lb/ft3

• Carbon tetrachloride: γ = 99.6 lb/ft3

• Chloroform: γ = 93 lb/ft3

• Ethylene glycol (ethanediol): γ = 69.22 lb/ft3

• Gasoline: γ = 41 lb/ft3 to 43 lb/ft3

• Glycerin: γ = 78.6 lb/ft3

• Isobutane (liquid): γ = 34.8 lb/ft3

• Kerosene: γ = 51.2 lb/ft3

• Mercury: γ = 849 lb/ft3

• Methanol (methyl alcohol): γ = 50.5 lb/ft3

• Milk: γ = 64.2 lb/ft3 to 64.6 lb/ft3

• Naphtha, petroleum: γ = 41.5 lb/ft3

• Oil, castor: γ = 60.5 lb/ft3

• Oil, coconut: γ = 57.7 lb/ft3

• Oil, linseed (boiled): γ = 58.8 lb/ft3

• Oil, olive: γ = 57.3 lb/ft3

• Propane (liquid): γ = 31.2 lb/ft3

• Toluene: γ = 54.1 lb/ft3

2Density figures taken or derived from tables in the CRC Handbook of Chemistry and Physics, 64th Edition. Most

liquid densities taken from table on page F-3 and solid densities taken from table on page F-1. Some liquid densities

taken from tables on pages E-27 through E-31. All temperatures at or near 20oC.

• Turpentine: γ = 54.3 lb/ft3

• Water, heavy: γ = 68.97 lb/ft3

• Water, light (normal): γ = 62.4 lb/ft3

• Water, sea: γ = 63.99 lb/ft3

Solids:

• Beryllium: γ = 115.37 lb/ft3

• Brass: γ = 524.4 lb/ft3

• Calcium: γ = 96.763 lb/ft3

• Carbon (diamond): γ = 196.65 lb/ft3 to 220.37 lb/ft3

• Cement (set): γ = 170 lb/ft3 to 190 lb/ft3

• Chromium: γ = 448.86 lb/ft3

• Copper: γ = 559.36 lb/ft3

• Cork: γ = 14 lb/ft3 to 16 lb/ft3

• Gold: γ = 1178.6 lb/ft3

• Ice: γ = 57.2 lb/ft3

• Iron: γ = 490.68 lb/ft3

• Ivory: γ = 114 lb/ft3 to 120 lb/ft3

• Lead: γ = 708.56 lb/ft3

• Leather: γ = 54 lb/ft3

• Magnesium: γ = 108.50 lb/ft3

• Molybdenum: γ = 638.01 lb/ft3

• Quartz: γ = 165 lb/ft3

• Rubber (soft): γ = 69 lb/ft3

• Rubber (hard): γ = 74 lb/ft3

• Salt, rock: γ = 136 lb/ft3

• Sugar: γ = 99 lb/ft3

• Tar: γ = 66 lb/ft3

• Wood, balsa: γ = 7 lb/ft3 to 9 lb/ft3

• Wood, maple: γ = 39 lb/ft3 to 47 lb/ft3

U can use the Babylon-Pro-Dict. conversion

Minh xin bổ sung. Sm3 là thể tích được tính ở 25oC 1atm, còn Nm3 là thể tích tính ở 0oC và 1atm.

Theo minh cái này bạn nên sử dụng phần mền Converts Unitscho tiện.