# 7.4: Unit Conversion Factors

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 Density $$\begin{array} {rcrl} {1\ Mg/m^3} & = & {1} & {gm/cm^3} \\ {} & = & {62.42} & {lb/ft^3} \\ {} & = & {0.03613}& {lb/in^3} \\ {} & = & {102.0} & {N/m^3} \end{array}$$ Energy $$\begin{array} {rcrl} {1\ J} & = & {0.2390} & {calorie} \\ {} & = & {9.45 \times 10^{-4}} & {Btu} \\ {} & = & {10^7} & {erg} \\ {} & = & {0.7376} & {ft-lb} \\ {} & = & {6.250 \times 10^{18}} & {ev}\end{array}$$ Force $$\begin{array} {rcrl} {1\ N} & = & {10^5} & {d\ (dyne)} \\ {} & = & {0.2248} & {lbf} \\ {} & = & {0.1020} & {kg} \\ {} & = & {3.597} & {oz} \\ {} & = & {1.124 \times 10^{-4}} & {ton\ (2000lb)} \end{array}$$ Length $$\begin{array} {rcrl} {1\ m} & = & {39.37} & {in} \\ {} & = & {3.281} & {ft} \\ {} & = & {10^{10}} & {\dot{A}} \end{array}$$ Mass $$\begin{array} {rcrl} {1\ kg} & = & {2.205} & {lb} \\ {} & = & {35.27} & {oz} \\ {} & = & {1.102 \times 10^{-3}} & {ton\ (2000lb)} \end{array}$$ Power $$\begin{array} {rcrl} {1\ W} & = & {1} & {J/s} \\ {} & = & {0.7378} & {ft-lb/s} \\ {} & = & {1.341 \times 10^{-3}} & {hp} \end{array}$$ Stress $$\begin{array} {rcrl} {1\ Pa} & = & {1} & {N/m^2} \\ {} & = & {10} & {d/cm^2} \\ {} & = & {1.449 \times 10^{-4}} & {psi} \\ {} & = & {1.020 \times 10^{-7}} & {kg/mm^2} \end{array}$$ Toughness $$1\ MPa \sqrt{m} = 0.910\ ksi\sqrt{in}$$

Physical constants:

Boltzman constant $$k = 1.381 \times 10^{-23}\ J/K$$

Gas constant $$R = 8.314\ J/mol-K$$

Avogadro constant $$N_A = 6.022 \times 10^{23} \ /mol$$

Acceleration of gravity $$g = 9.805 \ m/s^2$$

This page titled 7.4: Unit Conversion Factors is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by David Roylance (MIT OpenCourseWare) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.