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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 surroundings. An...

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...

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...

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Analysis of laser calorimetric data.

H B Rosenstock, M Hass, D A Gregory

|February 23, 2010

Summary

This summary is machine-generated.

Adiabatic laser calorimetry can distinguish between bulk and surface absorption in low-loss materials. The method uses a long rod sample and analyzes thermal rise curves to identify distinct absorption regions.

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Area of Science:

Materials Science
Optical Physics
Thermal Analysis

Background:

Adiabatic laser calorimetry is a key technique for measuring absorption coefficients in low-loss optical materials.
Distinguishing between bulk and surface absorption is crucial for understanding material properties and performance.

Purpose of the Study:

To adapt adiabatic laser calorimetry for differentiating bulk and surface absorption.
To analyze thermal rise curves for distinct absorption signatures.

Main Methods:

Utilizing a long rod sample geometry in adiabatic laser calorimetry.
Analyzing thermal rise curves under conditions of minimal heat loss.
Developing a theoretical model for interpreting calorimetric data.

Main Results:

Identified two distinct regions of constant slope in thermal rise curves.
The first slope corresponds to bulk absorption coefficient.
The second slope represents the sum of surface and bulk absorption coefficients.
Experimental data confirmed the predicted two-slope behavior.

Conclusions:

The adapted adiabatic laser calorimetry method effectively separates bulk and surface absorption.
This technique provides a more precise characterization of optical material absorption.
The findings are valuable for selecting and optimizing low-loss materials for optical applications.