conv_dim: Convert Dimensions of Measurement

In measurements: Tools for Units of Measurement

Convert Dimensions of Measurement

Description

Converts between dimensions of measurement given a transition dimension (the dimension that "bridges" x and y, e.g. liters per second, lbs per acre). Note that 2 of the 3 measurements (x, y, or trans) must be defined to calculate the 3rd. See conv_unit_options for all options.

Usage

conv_dim(x, x_unit, trans, trans_unit, y, y_unit)

Arguments

x	a numeric vector giving the measurement value in the first dimension.
x_unit	the unit in which x was measured.
trans	a numeric vector giving the measurement value in the transition dimension.
trans_unit	the unit in which trans was measured.
y	a numeric vector giving the measurement value in the second dimension.
y_unit	the unit in which y was measured.

Details

This function supports all dimensions in conv_unit_options except for coordinates. The conversion values have been defined based primarily from international weight and measurement authorities (e.g. General Conference on Weights and Measures, International Committee for Weights and Measures, etc.). While much effort was made to make conversions as accurate as possible, you should check the accuracy of conversions to ensure that conversions are precise enough for your applications.

Note

Duration

Years are defined as 365.25 days and months are defined as 1/12 a year.

Energy

cal is a thermochemical calorie (4.184 J) and Cal is 1000 cal (kcal or 4184 J).

Flow

All gallon-based units are US gallons.

Mass

All non-metric units are based on the avoirdupois system.

Power

hp is mechanical horsepower, or 745.69 W.

Speed

mach is calculated at sea level at 15 °C.

Author(s)

Matthew A. Birk, [e-mail]

See Also

conv_unit_options, conv_unit

Examples

# How many minutes does it take to travel 100 meters at 3 feet per second?
conv_dim(x = 100, x_unit = "m", trans = 3, trans_unit = "ft_per_sec", y_unit = "min")

# How many degrees does the temperature increase with an increase in 4 kPa given 0.8 Celcius
# increase per psi?
conv_dim(x_unit = "C", trans = 0.8, trans_unit = "C_per_psi", y = 4, y_unit = "kPa")

# Find the densities given volume and mass measurements.
conv_dim(x = c(60, 80), x_unit = "ft3", trans_unit = "kg_per_l", y = c(6e6, 4e6), y_unit = "g")

measurements documentation built on April 29, 2023, 1:13 a.m.