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The Density Determination of Small Solid Objects by a Simple Float Method-I.

Randall M Schoonover1

  • 1National Bureau of Standards, Washington, DC 20234.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

Determining the density of small solids is challenging. This new two-liquid float method uses hydrostatic weighing for accurate density measurements of materials like silicon and platinum.

Keywords:
density measurementfloat methodsmall solid objectssolid object density scale

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Metrology

Background:

  • Accurate density determination for small solid objects (milligram range) is technically challenging.
  • Traditional methods often lack precision or are difficult to implement for micro-scale samples.

Purpose of the Study:

  • To present a novel two-liquid float method for precise density determination of small solid objects.
  • To leverage advanced hydrostatic weighing techniques for absolute density measurements.

Main Methods:

  • Utilized a two-liquid float method incorporating hydrostatic weighing.
  • Employed a density scale based on solid objects for calibration and measurement.
  • Achieved an absolute density determination with an uncertainty of 500 parts per million (ppm).

Main Results:

  • The method successfully determined densities in the range of 2.3 g/cm³ (silicon) to 21.5 g/cm³ (platinum).
  • Applied the technique to measure the density variation in nickel alloys concerning phosphorus content.
  • Determined the density of optical fiber glass with high accuracy.

Conclusions:

  • The developed two-liquid float method offers a robust solution for precise density measurements of small solid objects.
  • This technique provides an absolute density determination with high accuracy and a broad material applicability.
  • The method is suitable for analyzing material properties, such as alloy composition and glass density.