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密度変換

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.

更新日 検証済みの例：4

変換元の単位で数値を入力するか、単位付きの数値を入力します
試す
変換後の値
lb/ft³
変換後の値: 62.4279605761 lb/ft³
有効桁数：12；最も近い値へ、等距離ならゼロから遠い値へ
単位換算
1 g/cm³ ≈ 62.42796 lb/ft³
換算係数
62.4279605761
正確さ
定義は正確、結果は循環小数

1 g/cm³は約62.42796 lb/ft³です。

同じ量を各単位で表示

g/cm³1 g/cm³lb/ft³62.42796 lb/ft³
1 g/cm³を各密度単位で表示 行数：7
単位値定義
kilogram per cubic metre (kg/m³)1,000基本単位
gram per cubic centimetre (g/cm³)11 g/cm³ = 1,000 kg/m³、正確な値
gram per millilitre (g/mL)11 g/mL = 1,000 kg/m³、正確な値
kilogram per litre (kg/L)11 kg/L = 1,000 kg/m³、正確な値
pound per cubic foot (lb/ft³)62.427961 lb/ft³ = 0.45359237/0.028316846592 kg/m³、正確な値
pound per cubic inch (lb/in³)0.036127291 lb/in³ = 0.45359237/0.000016387064 kg/m³、正確な値
pound per US gallon (lb/gal)8.3454041 lb/gal = 0.45359237/0.003785411784 kg/m³、正確な値
計算方法 S

  1. gram per cubic centimetreからkilogram per cubic metreへ換算

    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、正確な値

  2. kilogram per cubic metreからpound per cubic footへ換算

    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、正確な値

  3. 統合した換算係数

    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$^{3}$}

    両方の単位の定義は正確ですが、変換後の値は循環小数です。有効数字12桁で表示します。

密度変換について

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%.

計算例

1 g/cm³ in lb/ft³

値
1 g/cm³
変換元
gram per cubic centimetre (g/cm³)
変換先
pound per cubic foot (lb/ft³)
変換後の値
62.4279605761 lb/ft³

照合元：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

値
1000 kg/m³
変換元
kilogram per cubic metre (kg/m³)
変換先
gram per millilitre (g/mL)
変換後の値
1 g/mL

照合元：1000 kg/m³ = 1 g/cm³ = 1 g/mL

1 lb/gal in kg/m³

値
1 lb/gal
変換元
pound per US gallon (lb/gal)
変換先
kilogram per cubic metre (kg/m³)
変換後の値
119.826427317 kg/m³

照合元：0.45359237 / 0.003785411784 (Python 3.8 fractions from the legal definitions)

1 lb/in³ in g/cm³

値
1 lb/in³
変換元
pound per cubic inch (lb/in³)
変換先
gram per cubic centimetre (g/cm³)
変換後の値
27.6799047102 g/cm³

照合元：0.45359237 kg / 0.000016387064 m³ ÷ 1000 (Python 3.8 fractions from the legal definitions)

よくある質問

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.

「密度変換」の精度はどのくらいですか？

精度は入力値と計算方法の前提に依存します。十進演算には有効数字50桁を使いますが、推定、数値計算手法、元データの精度はそれより低い場合があります。表示の丸め処理でこれらの制約がなくなるわけではありません。 独立した出典の解答と照合した計算例：4。 例えば、「1 g/cm³ in lb/ft³」は1000 kg/m³ ÷ (0.45359237 kg / 0.028316846592 m³) = 14158423296/226796185 (Python 3.8 fractions from the legal definitions)と照合しています。

この計算方法の出典は何ですか？

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.

この計算機について

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}

出典

  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

出典と照合済み

この計算機には、独立した出典の解答を使った計算例が 4 件あります。テストに組み込まれており、ここでも実行できます。

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