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Van de Graaff Generator01:15

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
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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...
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Related Experiment Video

Updated: Jun 28, 2026

Conducting Miller-Urey Experiments
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Published on: January 21, 2014

The Miller volcanic spark discharge experiment.

Adam P Johnson1, H James Cleaves, Jason P Dworkin

  • 1Interdisciplinary Biochemistry Program, Indiana University, Bloomington, IN 47401, USA.

Science (New York, N.Y.)
|October 18, 2008
PubMed
Summary

Miller

Area of Science:

  • Astrobiology
  • Origin of Life Studies
  • Geochemistry

Background:

  • Stanley Miller's 1950s experiments simulated early Earth conditions.
  • The classic Miller experiment used a "spark flask" to generate organic molecules.

Purpose of the Study:

  • To reanalyze original extracts from Miller's less-known "volcanic apparatus" experiment.
  • To investigate the prebiotic synthesis of amino acids under simulated volcanic conditions.

Main Methods:

  • Reanalysis of original chemical extracts from Miller's 1950s experiments.
  • Utilized a "volcanic apparatus" that generated hot water mist to simulate volcanic eruptions.

Main Results:

  • The volcanic apparatus produced a broader spectrum of amino acids compared to the classic setup.

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  • Identified key prebiotic compounds formed under simulated early Earth volcanic conditions.

    • Conclusions:

    • Volcanic eruptions releasing reduced gases, coupled with lightning, were plausible on early Earth.
    • These environments could have facilitated the synthesis and accumulation of vital prebiotic compounds for life's origin.