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Related Concept Videos

Constant Volume Calorimetry02:41

Constant Volume Calorimetry

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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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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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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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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Methane Hydrate Crystallization on Sessile Water Droplets
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Isothermal method for hydrate studies using a transparent variable volume cell.

P T Ngema1, W M Nelson1, P Naidoo1

  • 1School of Engineering, Thermodynamics Research Unit, University of KwaZulu Natal, ZA-4041 Durban, South Africa.

The Review of Scientific Instruments
|May 3, 2014
PubMed
Summary
This summary is machine-generated.

Measuring hydrate dissociation points is time-consuming with the isochoric method. A new transparent variable volume cell allows for rapid, efficient hydrate dissociation pressure measurements under isothermal conditions.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Chemical Engineering

Background:

  • Hydrate dissociation point measurements are crucial for understanding phase behavior in various industrial applications.
  • The conventional isochoric method, while established, is time-consuming and inefficient, particularly at higher pressures.
  • High-pressure experiments require robust equilibrium cells that can impede rapid heat exchange.

Purpose of the Study:

  • To introduce a novel transparent variable volume cell for hydrate dissociation pressure measurements.
  • To demonstrate an efficient and rapid measurement procedure using an isothermal method.
  • To overcome the limitations of the traditional isochoric method for hydrate studies.

Main Methods:

  • Development and utilization of a transparent variable volume cell.
  • Application of an isothermal measurement procedure for hydrate dissociation pressure.
  • Comparison of the novel method's efficiency with the conventional isochoric method.

Main Results:

  • The variable volume cell enables measurements under isothermal conditions, significantly reducing experiment time.
  • The transparent nature of the cell facilitates direct observation during measurements.
  • The isothermal procedure coupled with the variable volume cell proves to be efficient and rapid.

Conclusions:

  • The transparent variable volume cell offers a significant advancement for studying hydrate dissociation pressures.
  • This method provides a faster and more efficient alternative to the isochoric technique, especially at elevated pressures.
  • The developed apparatus and procedure are valuable tools for hydrate research and industrial applications.