unit_wt: Unit Weight or Specific Weight

In iemisc: Irucka Embry's Miscellaneous Functions

Unit Weight or Specific Weight

Description

This function solves for the unit weight or specific weight of a substance using only the substance's density and gravitational acceleration.

Usage

unit_wt(rho, units = c("SI", "Eng"), Eng_units = c("slug/ft^3", "lbm/ft^3"))

Arguments

rho	numeric vector that contains the density
units	character vector that contains the system of units options are SI for International System of Units or Eng for English units (United States Customary System in the United States and Imperial Units in the United Kingdom)
Eng_units	character vector that contains the density English units options are lbm/ft^3 or slug/ft^3

Details

The equation is expressed as

\\gamma = \frac{m * g}{V} = \\rho * g = \\rho * \frac{g}{gc}

\gamma

unit weight or specific weight (N/m^3 or lbf/ft^3)

m

substance mass (kg, lbm, or slugs)

g

gravitational acceleration (m/s^2 or ft/sec^2)

gc

"unit conversion factor used to convert mass to force or vice versa" (lbm-ft/lbf-sec^2)

V

the volume of the substance (m^3 or ft^3)

\rho

substance density (mass divided by volume) [kg/m^3, slug/ft^3", or lbm/ft^3]

Value

the unit weight or specific weight as a numeric vector. The units are not returned.

Author(s)

Irucka Embry

References

1. The Engineering ToolBox, 27 March 2022, "Water - Density, Specific Weight and Thermal Expansion Coefficients", https://www.engineeringtoolbox.com/water-density-specific-weight-d_595.html

2. WikiEngineer, 27 March 2022, "Water Properties & Definitions", https://web.archive.org/web/20210412034245/http://www.wikiengineer.com/Water-Resources/PropertiesAndDefinitions. Retrieved thanks to the Internet Archive: Wayback Machine

3. Wikimedia Foundation, Inc. Wikipedia, 27 March 2022, "gc (engineering)", https://en.wikipedia.org/wiki/Gc_(engineering).

4. Wikimedia Foundation, Inc. Wikipedia, 27 March 2022, "Specific weight", https://en.wikipedia.org/wiki/Specific_weight.

Examples

# Examples

library(iemisc)

rho1 <- density_water(Temp = 68, units = "Eng", Eng_units = "slug/ft^3")

unit_wt(rho = rho1, units = "Eng", Eng_units = "slug/ft^3")


rho2 <- density_water(Temp = 68, units = "Eng", Eng_units = "lbm/ft^3")

unit_wt(rho = rho2, units = "Eng", Eng_units = "lbm/ft^3")


rho3 <- density_water(Temp = 20, units = "SI")

unit_wt(rho = rho3, units = "SI")

iemisc documentation built on Sept. 25, 2023, 5:09 p.m.