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Related Concept Videos

Flame Photometry: Overview01:02

Flame Photometry: Overview

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Gas Chromatography: Types of Detectors-II01:19

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Constant Volume Calorimetry02:41

Constant Volume Calorimetry

31.7K
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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Related Experiment Video

Updated: Apr 1, 2026

Research and Development of High-performance Explosives
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Diagnostic techniques in deflagration and detonation studies.

William G Proud1, David M Williamson2, John E Field2

  • 1Surface Microstructure and Fracture Group, Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE Uinted Kingdom ; Institute of Shock Physics, Imperial College London, Blackett Laboratory, Prince Consort Road, London, SW7 2AZ United Kingdom.

Chemistry Central Journal
|October 6, 2015
PubMed
Summary

High-speed experimental techniques reveal energetic material processes from hot-spot formation to detonation. Linking small-scale quantitative studies with predictive models enhances experimental design for safety and performance.

Keywords:
CharacterisationDiagnosticExperimentalHigh-speedQuantitative

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physics

Background:

  • Energetic materials research requires advanced techniques to understand complex processes.
  • Small-scale, quantitative studies are crucial for detailed analysis and model validation.

Approach:

  • This review focuses on high-speed experimental methods for studying energetic materials.
  • Techniques cover hot-spot formation, ignition, deflagration, sensitivity, and detonation.
  • Includes thermal ignition, drop-weight, Hopkinson Bar, and Plate Impact stimuli.

Key Points:

  • Experimental data must be integrated with predictive models for informed design.
  • Inert simulant studies help distinguish reactive behavior from mechanical responses.
  • Focus on quantitative, small-scale experiments provides high-fidelity insights.

Conclusions:

  • Advanced experimental techniques are vital for elucidating energetic material behavior.
  • The synergy between experimentation and modeling drives progress in the field.
  • Understanding fundamental processes improves the safety and predictability of energetic materials.