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密度转换器

Convert g/cm³ to kg/m³, kg/m³ to lb/ft³ and lb/gal (ppg), and g/mL to kg/L, with exact factors from the 1959 pound and foot.

更新于 已验证的示例：4

输入源单位下的数值，也可以输入带有自身单位的数值
试一试
转换后的数值
lb/ft³
转换后的数值: 62.4279605761 lb/ft³
有效数字：12；取最近值，等距时远离零
换算
1 g/cm³ ≈ 62.42796 lb/ft³
换算系数
62.4279605761
精确性
定义精确，结果为循环小数

1 g/cm³约为62.42796 lb/ft³。

用各个单位表示同一个量

g/cm³1 g/cm³lb/ft³62.42796 lb/ft³
1 g/cm³用各个密度单位表示 行数：7
单位数值定义
kilogram per cubic metre (kg/m³)1,000基本单位
gram per cubic centimetre (g/cm³)11 g/cm³ = 1,000 kg/m³，精确值
gram per millilitre (g/mL)11 g/mL = 1,000 kg/m³，精确值
kilogram per litre (kg/L)11 kg/L = 1,000 kg/m³，精确值
pound per cubic foot (lb/ft³)62.427961 lb/ft³ = 0.45359237/0.028316846592 kg/m³，精确值
pound per cubic inch (lb/in³)0.036127291 lb/in³ = 0.45359237/0.000016387064 kg/m³，精确值
pound per US gallon (lb/gal)8.3454041 lb/gal = 0.45359237/0.003785411784 kg/m³，精确值
计算方法 S

  1. 将gram per cubic centimetre换算为kilogram per cubic metre

    1 g/cm3×1,000 kg/m3g/cm3=1,000 kg/m31\ \text{g/cm$^{3}$} \times 1{,}000\ \tfrac{\text{kg/m$^{3}$}}{\text{g/cm$^{3}$}} = 1{,}000\ \text{kg/m$^{3}$}

    1 g/cm³ = 1,000 kg/m³，精确值

  2. 将kilogram per cubic metre换算为pound per cubic foot

    1,000 kg/m3÷0.453592370.028316846592 kg/m3lb/ft3=62.4279605761 lb/ft31{,}000\ \text{kg/m$^{3}$} \div \tfrac{0.45359237}{0.028316846592}\ \tfrac{\text{kg/m$^{3}$}}{\text{lb/ft$^{3}$}} = 62.4279605761\ \text{lb/ft$^{3}$}

    1 lb/ft³ = 0.45359237/0.028316846592 kg/m³，精确值

  3. 合并换算系数

    1 g/cm3=1,0000.453592370.028316846592 lb/ft3≈62.4279605761 lb/ft31\ \text{g/cm$^{3}$} = \frac{1{,}000}{\tfrac{0.45359237}{0.028316846592}}\ \text{lb/ft$^{3}$} \approx 62.4279605761\ \text{lb/ft$^{3}$}

    两个单位的定义都精确，但换算结果为循环小数；结果显示12位有效数字。

关于密度转换器

Density is mass per volume, so each unit is a mass unit divided by a volume unit, held here as kilograms per cubic metre. The metric units differ by powers of 1,000 (1 g/cm³ = 1 g/mL = 1 kg/L = 1,000 kg/m³), and the imperial ones follow from the exact pound and foot: 1 lb/ft³ = 16.0185 kg/m³.

The default converts 1 g/cm³, close to the density of water, to 62.428 lb/ft³. Engineers use lb/ft³ (pcf) for soils and concrete, drillers use lb/gal (ppg) for drilling mud, and materials data sheets use g/cm³.

Density changes with temperature, and the converter only changes units. Pure water is densest near 4 °C at 999.97 kg/m³ and is 998.2 kg/m³ at 20 °C, so “1 g/cm³ for water” is right to within 0.2%.

计算示例

1 g/cm³ in lb/ft³

数值
1 g/cm³
从
gram per cubic centimetre (g/cm³)
到
pound per cubic foot (lb/ft³)
转换后的数值
62.4279605761 lb/ft³

核验来源：1000 kg/m³ ÷ (0.45359237 kg / 0.028316846592 m³) = 14158423296/226796185 (Python 3.8 fractions from the legal definitions)

1000 kg/m³ in g/mL

数值
1000 kg/m³
从
kilogram per cubic metre (kg/m³)
到
gram per millilitre (g/mL)
转换后的数值
1 g/mL

核验来源：1000 kg/m³ = 1 g/cm³ = 1 g/mL

1 lb/gal in kg/m³

数值
1 lb/gal
从
pound per US gallon (lb/gal)
到
kilogram per cubic metre (kg/m³)
转换后的数值
119.826427317 kg/m³

核验来源：0.45359237 / 0.003785411784 (Python 3.8 fractions from the legal definitions)

1 lb/in³ in g/cm³

数值
1 lb/in³
从
pound per cubic inch (lb/in³)
到
gram per cubic centimetre (g/cm³)
转换后的数值
27.6799047102 g/cm³

核验来源：0.45359237 kg / 0.000016387064 m³ ÷ 1000 (Python 3.8 fractions from the legal definitions)

常见问题

How do I convert g/cm³ to kg/m³?

Multiply by 1,000. A cubic metre holds 10⁶ cubic centimetres and a kilogram is 1,000 grams, so 1 g/cm³ = 1,000 kg/m³. Aluminium at 2.70 g/cm³ is 2,700 kg/m³, and steel at about 7.85 g/cm³ is 7,850 kg/m³. g/mL and kg/L are the same size as g/cm³.

What is specific gravity?

The ratio of a substance's density to the density of water, so it has no unit. Referenced to water at 4 °C (999.97 kg/m³), specific gravity equals the density in g/cm³ to within 0.003%: a liquid of 0.80 g/cm³ has a specific gravity of 0.80. Other references, such as water at 60 °F, change the fourth significant digit.

How do I convert lb/ft³ to kg/m³?

Multiply by 16.0185. A pound is 0.45359237 kg and a cubic foot 0.028316846592 m³, both exact, so 1 lb/ft³ = 16.01846337 kg/m³. Normal-weight concrete at about 150 lb/ft³ is about 2,400 kg/m³, and 1,000 kg/m³ is 62.43 lb/ft³.

What does ppg mean for drilling mud?

Pounds per US gallon, the density unit of oilfield drilling fluids. 1 lb/gal is 119.826 kg/m³, so fresh water at 20 °C is 8.33 ppg and a 12 ppg mud is 1,438 kg/m³, or 1.44 g/cm³. Mud weight sets the pressure the fluid column exerts at the bottom of the well.

Is the density of water exactly 1 g/cm³?

No, but close. Pure water peaks at 999.97 kg/m³ near 4 °C and is 998.2 kg/m³ at 20 °C. The gram was first defined in 1795 as the mass of 1 cm³ of water, and from 1901 to 1964 the litre was defined as the volume of 1 kg of water, which is why the numbers nearly coincide.

“密度转换器”有多准确？

准确性取决于输入值和方法的假设。十进制运算使用50位有效数字，但估算、数值方法和源数据的精度可能较低；显示时的舍入并不能消除这些限制。 已按独立来源核验的计算示例：4。 例如，“1 g/cm³ in lb/ft³”根据1000 kg/m³ ÷ (0.45359237 kg / 0.028316846592 m³) = 14158423296/226796185 (Python 3.8 fractions from the legal definitions)进行核验。

这种方法出自哪里？

NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement.

关于此计算器

xto=xfrom×ffromftof=one unit expressed in kg/m3\begin{gathered} x_{\text{to}} = x_{\text{from}} \times \dfrac{f_{\text{from}}}{f_{\text{to}}} \\ f = \text{one unit expressed in } \text{kg/m$^{3}$} \end{gathered}

来源

  1. NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors
  2. NIST Handbook 44, Appendix C — General tables of units of measurement

已对照来源验证

此计算器包含 4 个已解示例，答案来自独立来源。这些示例会在测试套件中运行，你也可以在此运行验证。

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