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Constant Pressure Calorimetry

Constant Pressure Calorimetry

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...

Calorimetry

Calorimetry

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...

Assessing Body Temperature - Rectal

Assessing Body Temperature - Rectal

Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...

Equipments Used to Measure Body Temperature

Equipments Used to Measure Body Temperature

Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...

Constant Volume Calorimetry

Constant Volume Calorimetry

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...

Assessing Body Temperature - Oral

Assessing Body Temperature - Oral

Here are the steps to accurately measure oral temperature using an electronic thermometer:
Step 1:
Start by practicing proper hand hygiene to prevent the spread of microorganisms.
Step 2:
Take the thermometer out of the charging unit, switch it on, and wait for the ready sign.
Step 3:
Gently slide the probe cover until a click is heard. This simple action prevents cross-contamination and ensures the correct placement of the probe cover.
Step 4:
Instruct the patient to open their mouth and place...

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Related Experiment Video

Updated: Feb 27, 2026

Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans

Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans

Published on: June 2, 2023

Indirect Calorimetry: From Bench to Bedside.

Riddhi Das Gupta¹, Roshna Ramachandran¹, Padmanaban Venkatesan²

¹Department of Endocrinology, Diabetes and Metabolism, Christian Medical College, Vellore, Tamil Nadu, India.

Indian Journal of Endocrinology and Metabolism

|July 4, 2017

Summary

Indirect calorimetry (IC) accurately measures energy expenditure (EE) but is underused in clinical settings. Advances in technology and education can improve its application for nutritional assessment and understanding metabolic diseases.

Keywords:

Energy expenditure calorimetry indirect

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Published on: May 10, 2024

Area of Science:

Metabolic Physiology
Clinical Nutrition
Medical Technology

Background:

Accurate energy expenditure (EE) measurement is crucial but often overlooked in clinical practice.
Indirect calorimetry (IC) is a sensitive, accurate, and noninvasive method for determining EE.
IC applications extend beyond nutritional needs to nutrient assimilation, thermogenesis, exercise energetics, and metabolic disease pathogenesis.

Purpose of the Study:

To review the physicochemical principles, clinical applications, and technological advancements of indirect calorimetry (IC).
To highlight the underappreciation of IC due to limited medical education and to advocate for its increased use.
To discuss potential pitfalls and recent adaptations of IC for long-term human studies.

Main Methods:

Review of the physicochemical background of indirect calorimetry (IC).
Examination of various clinical indications and established techniques/instruments for IC.
Analysis of recent technological advancements enabling long-term IC studies.

Main Results:

Indirect calorimetry (IC) offers precise measurement of energy expenditure (EE) with broad clinical relevance.
Limited medical training on IC leads to underutilization despite its benefits.
Technological improvements and cost-effectiveness are poised to increase IC adoption.

Conclusions:

Indirect calorimetry (IC) is an essential tool for accurate energy expenditure (EE) assessment in diverse clinical scenarios.
Enhanced medical education and accessible technology are key to realizing the full potential of IC.
Future directions include wider implementation and application in long-term physiological monitoring.