# Wolfram Function Repository

Instant-use add-on functions for the Wolfram Language

Function Repository Resource:

Compute the approximate survival time of a human in cold water

Contributed by:
Claudio Lobo Chaib Filho
| claudioc

ResourceFunction["ColdWaterSurvivalTime"][ estimates the survival time in cold water for a temperature | |

ResourceFunction["ColdWaterSurvivalTime"][ gives the property |

ResourceFunction["ColdWaterSurvivalTime"] is useful to inform how long a person can survive hypothermia.

Any temperature quantity is accepted by the function. If the argument is not a Quantity, it is interpreted as "DegreesCelsius".

The temperature values *temp* accepted by the function must be in the temperature range 0 to 20 degrees Celsius.

Available properties include:

"SurvivalTime" | time a human can survive in cold water of the specified temperature |

"MetabolicHeat" | heat generated by the body in the cold water |

"CoolingRate" | body's cooling rate |

"Plot" | plot of the curve of survival time versus water temperature |

"PropertyAssociation" | all results as an Association |

ResourceFunction["ColdWaterSurvivalTime"][*temp*] is equivalent to ResourceFunction["ColdWaterSurvivalTime"][*temp*,"SurvivalTime"].

The "Plot" property shows the survival time curve. The *x*-axis is the water temperature and *y*-axis is the survival time. The input *temp* is displayed as a red point.

ResourceFunction["ColdWaterSurvivalTime"] accepts the options:

"EnergyUnit" | "Calories" | unit of the result heat ("Kilojoules", "Watts", …) |

"TimeUnit" | "Minutes" | unit of time in the results |

Get the survival time in cold water at a specific temperature:

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The function interprets any unit type of degrees for temperature:

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The function used with one argument is similar to the function with two arguments where the second is "SurvivalTime":

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If a Quantity is not specified, it is interpreted in "DegreesCelsius":

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Obtain the heat generated by the body in water at the specified temperature:

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Obtain the body’s cooling rate for a specific temperature:

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Use "Plot" to obtain the survival time curve (*y* axis) for different water temperatures (*x* axis):

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Use "PropertyAssociation" to get all the information simultaneously for a specific temperature. Note that the result is given in the same temperature units as the input:

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Get information using another unit of heat with the option "EnergyUnit":

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Choose another unit of time with the "TimeUnit" option:

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Change both the unit of energy and the time. The plot and the result use the chosen time unit and a given requested energy unit:

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Note that even if the temperature unit is not degrees Celsius, the *x* axis of the graph remains in that unit:

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If the required property does not contain information about the energy, the "EnergyUnit" option does not influence the output:

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This work is licensed under a Creative Commons Attribution 4.0 International License