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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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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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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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Specific Heat01:16

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The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
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There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
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A solid-state, open-system, differential calorimeter.

Shelby Lacouture1, Trevor Dardik1, Dennis Van der Vliet2

  • 1Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas 79410, USA.

The Review of Scientific Instruments
|October 2, 2020
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Summary
This summary is machine-generated.

This study presents a novel open system calorimeter for measuring heat in real-world conditions. The device accurately quantics energy and power, even with fluctuating room temperatures.

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Area of Science:

  • Thermochemistry
  • Calorimetry
  • Engineering

Background:

  • Traditional calorimeters often require controlled environments.
  • Measuring heat flux in open systems presents unique challenges.
  • Existing methods may struggle with ambient temperature and airflow variations.

Purpose of the Study:

  • To design, model, construct, and evaluate an open system calorimeter.
  • To enable measurement of endothermic/exothermic events under steady heat flux in a normal room environment.
  • To develop a calorimeter immune to ambient temperature and airflow variations.

Main Methods:

  • Utilized lumped parameter electrical-thermal equivalent circuits in SPICE for modeling.
  • Implemented a solid-state heating and cooling assembly as an electronic heat reservoir.
  • Developed a mathematical correction factor to address thermal path and sensor sensitivity differences.

Main Results:

  • The calorimeter operates effectively in a normal room environment.
  • It accurately measures energy and power from milliwatts to several watts.
  • The system demonstrates near immunity to ambient temperature and airflow fluctuations.
  • Validation was achieved using precise electrical joule heating.

Conclusions:

  • The developed open system calorimeter offers a unique solution for measuring heat in uncontrolled environments.
  • The novel design and modeling approach ensure accurate and reliable measurements.
  • This technology has potential applications in various scientific and engineering fields requiring thermal analysis.