Description Usage Arguments Details Author(s) See Also Examples

View source: R/conv_resp_unit.R

Converts units of measurement that are joined by " / " or " * ". This function expands upon `conv_multiunit`

to incorporate O2 unit conversion and seawater volume-mass conversions.

1 2 | ```
conv_resp_unit(value, from, to, temp = 25, sal = 35,
atm_pres = 1013.25, o2_conc_base = "per_l")
``` |

`value` |
a numeric vector giving the measurement value in its original units. |

`from, to` |
a string defining the unit with subunits separated by " / " or " * ". See Details for proper notation regarding O2 and seawater mass/volume. |

`temp` |
temperature (°C). Default is 25 °C. |

`sal` |
salinity (psu). Default is 35 psu. |

`atm_pres` |
atmospheric pressure (mbar). Default is 1013.25 mbar. |

`o2_conc_base` |
(optional) if converting between pO2 and [O2], should concentrations be "per_l" or "per_kg"? Default is "per_l". |

The O2 units supported by `conv_o2`

should be appended with "_O2" (e.g. "kPa_O2"; even "percent_o2_O2") and O2 unit concentrations should drop "per_l" or "per_kg" (e.g. "umol_O2"). To designate seawater mass-volume conversion, append the unit with "_seawater" (e.g. "kg_seawater").

Matthew A. Birk, [email protected]

1 2 3 4 5 6 7 8 9 10 11 12 | ```
# I read that an animal's MO2 is 1.92 ml O2/kg/min. What is this MO2 in umol O2/g/h?
conv_resp_unit(value = 1.92, from = "ml_O2 / kg / min", to = "umol_O2 / g / hr")
# Krogh's diffusion coefficient for oxygen through gills can be expressed as ml O2 / mm2 (gill
# surface area) / um (gill thickness) / torr (seawater pO2 - blood pO2) / minute at a given
# temperature.
# To convert to another unit:
conv_resp_unit(value = 1e-6, from = "ml_O2 / mm2 / um / torr / min",
to = "umol_O2 / cm2 / um / kPa / hr", temp = 20)
# Now, with a knowledge of gill morphometrics, seawater pO2, and blood pO2, I can compare
# gill diffusion with whole animal MO2.
``` |

respirometry documentation built on Aug. 13, 2018, 9:04 a.m.

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