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Related Concept Videos

Constant Pressure Calorimetry03:02

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...
Constant Volume Calorimetry02:41

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...
Calorimetry01:19

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 surroundings. An...
The Joule and Joule–Thomson Experiments01:23

The Joule and Joule–Thomson Experiments

Consider an adiabatic system composed of two chambers, A and B, designed such that no heat flows into or out of the system. Initially, chamber A is filled with a gas at a fixed temperature T1, pressure p1, and volume V1, while chamber B is evacuated. The gas is then gradually forced through a rigid, porous barrier to chamber B, ultimately reaching temperature T2, pressure p2, and volume V2. A piston on the right side maintains a constant pressure (p2), which is lower than p1. The significant...
Path Between Thermodynamics States01:21

Path Between Thermodynamics States

Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
Le Chatelier's Principle: Changing Volume (Pressure)02:32

Le Chatelier's Principle: Changing Volume (Pressure)

For gas-phase equilibria, changes in the concentrations of reactants and products can occur with altered volume and pressure. The partial pressure, P, of an ideal gas is proportional to its molar concentration, M.

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Related Experiment Video

Updated: Jul 10, 2026

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
09:12

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

Published on: June 28, 2015

Pressure perturbation calorimetry.

P D Heiko Heerklotz1

  • 1Division of Biophysical Chemistry, Biozentrum of the University of Basel, Switzerland.

Methods in Molecular Biology (Clifton, N.J.)
|October 24, 2007
PubMed
Summary

Pressure perturbation calorimetry precisely measures solute thermal expansion in water. This automated technique detects lipid transitions and quantifies volume changes with high accuracy.

Area of Science:

  • Physical chemistry
  • Materials science

Background:

  • Lipid systems exhibit thermotropic transitions, involving significant volume changes.
  • Characterizing these transitions and associated kinetics is crucial for understanding material behavior.

Purpose of the Study:

  • To introduce and detail the application of pressure perturbation calorimetry (PPC).
  • To demonstrate PPC's capability in measuring temperature-dependent thermal volume expansion of solutes in aqueous dispersion.
  • To highlight PPC's utility in characterizing thermotropic transitions in lipid systems.

Main Methods:

  • Utilizes a high-sensitivity isothermal calorimeter to measure heat response.
  • Applies small, isothermal pressure perturbations to the sample.
  • Leverages thermodynamic principles to calculate thermal expansion from calorimetric data.

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Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen
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Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
10:52

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System

Published on: August 7, 2018

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Last Updated: Jul 10, 2026

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
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Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen
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Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen

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Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
10:52

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Published on: August 7, 2018

Main Results:

  • Achieves highly precise measurements of thermal expansion.
  • Enables characterization of volume changes and kinetics during thermotropic transitions.
  • Requires minimal sample material for experiments.

Conclusions:

  • Pressure perturbation calorimetry is a powerful, automated technique for precise thermodynamic measurements.
  • PPC offers a convenient method for studying volume changes in lipid systems and other colloidal particles.
  • The technique provides valuable insights into the thermal expansion behavior of solutes in aqueous environments.