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Related Concept Videos

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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Related Experiment Video

Updated: Dec 26, 2025

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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Temperature loss by ventilation in a calorimetric bench model.

Holger Herff1, Daniel C Schroeder1, Kevin Bowden2

  • 1Department of Anaesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany.

Medical Gas Research
|March 20, 2020
PubMed
Summary
This summary is machine-generated.

Emergency medicine patients ventilated with cold, dry oxygen experience faster cooling. Using warm, humidified oxygen significantly reduces this temperature loss, crucial for preventing hypothermia in trauma patients.

Keywords:
calorimetric modelemergency medicineheat moisture exchangershypothermiamechanical ventilationmultiple traumasimulationtemperatureventilation gaseswater dummy

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Area of Science:

  • Critical Care Medicine
  • Physiology
  • Biomedical Engineering

Background:

  • Heat moisture exchangers (HMEs) are standard in intensive care to warm and humidify ventilation gases.
  • Intubated emergency medicine patients, especially trauma victims, are at risk of hypothermia.
  • These patients may receive cold, dry medical oxygen, increasing heat loss.

Purpose of the Study:

  • To quantify temperature loss in patients ventilated with cold, dry oxygen compared to warm, humidified oxygen.
  • To evaluate the effectiveness of standard ventilation gas conditioning in preventing patient hypothermia.

Main Methods:

  • A 50-kg water-dummy, simulating a 60-kg patient's calorimetric capacity, was ventilated for 2 hours.
  • Ventilation parameters: tidal volume 400 mL, respiratory rate 13/min.
  • Two conditions tested: cold (10°C) dry oxygen vs. warm (43°C) humidified oxygen.

Main Results:

  • After 2 hours, the water-dummy temperature was 29.7 ± 0.1°C with cold, dry oxygen.
  • With warm, humidified oxygen, the temperature was 30.4 ± 0.1°C.
  • Cold, dry oxygen resulted in an approximately 0.35°C/hour faster cooling rate.

Conclusions:

  • Ventilation with cold, dry oxygen accelerates patient cooling by ~0.35°C per hour.
  • This highlights the importance of using warm, humidified gases to prevent hypothermia in critically ill patients.
  • Standard HMEs are vital for maintaining patient thermal stability during mechanical ventilation.