pressure_to_volume: Convert Pressure to Gas Volume

In rumenGP: Rumen Gas Production Modeling, Comparison, and Visualization

Convert Pressure to Gas Volume

Description

Converts pressure measurements to estimated gas volumes using the ideal gas law.

Usage

pressure_to_volume(
  pressure,
  pressure_unit = c("psi", "kpa"),
  headspace_volume,
  headspace_unit = c("mL", "L"),
  temperature = 39
)

Arguments

pressure	Numeric pressure values.
pressure_unit	Pressure unit. One of: "psi" "kpa"
headspace_volume	Headspace volume.
headspace_unit	Headspace volume unit. One of: "mL" "L"
temperature	Incubation temperature in degrees Celsius.

Details

The function supports pressure measurements in PSI or kPa and headspace volumes in mL or L.

Equation

Gas volume is estimated using the ideal gas law:

PV = nRT

where:

• P is pressure

• V is headspace volume

• n is gas moles

• R is the gas constant

• T is absolute temperature

Estimated gas moles are converted to an equivalent gas volume.

Value

A numeric vector containing estimated gas volumes in mL.

Examples

# Convert PSI measurements
pressure_to_volume(
  pressure = c(
    0.5,
    1.0,
    1.5
  ),
  pressure_unit = "psi",
  headspace_volume = 60,
  headspace_unit = "mL",
  temperature = 39
)

# Convert kPa measurements
pressure_to_volume(
  pressure = c(
    5,
    10,
    15
  ),
  pressure_unit = "kpa",
  headspace_volume = 0.06,
  headspace_unit = "L",
  temperature = 39
)

rumenGP documentation built on Oct. 2, 2026, 5:09 p.m.