Ductility
المؤلف:
GEORGE A. HOADLEY
المصدر:
Essentials of Physics
الجزء والصفحة:
p-24
2025-10-21
48
A substance that can be drawn into wire is said to be ductile. Some metals possess great ductility. Platinum has been drawn into wire only 0.00003 of an inch thick. In order to do this, a small platinum wire was covered with silver, forming a compound cylinder, the silver surrounding the platinum much as the wood surrounds the graphite in a lead pencil. This cylinder was drawn into a very small wire, which had still a platinum center surrounded by silver; then the silver was dissolved by an acid which does not affect platinum, and the platinum was left as a wire of microscopic fineness.
Demonstration. - Take a piece of glass tubing about 10 cm. long by the ends and hold the middle in the flame of a Bunsen burner near the top. When it becomes cherry red remove it from the flame and draw it out with a steady pull. Prove that it is a tube by blowing through it when one end is under the surface of water.
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