Quick Answer:The Steel Wire (100gm) is a 100 g spool of high-tensile carbon spring-steel wire, used as the test wire in Searle’s apparatus for Young’s modulus and as the vibrating wire on a sonometer.
Last updated: 18 October 2026
Key Features
High-tensile carbon steel of spring-steel grade.
100 g net on each spool.
High Young’s modulus, about 200 GPa.
Shows minimal permanent set under normal lab loads.
Supplied in common SWG gauges.
Technical Specifications
Specification
Value
Material
High-tensile carbon steel (spring steel grade)
Net weight
100 g per spool
Young’s modulus
Y ≈ 200 GPa
Gauge
Common SWG sizes
Packing
Wound on a spool
How It Is Used
A length is cut and clamped in Searle’s apparatus, then loaded in steps while the extension is measured to calculate Young’s modulus. On a sonometer the same wire is stretched over the bridges and its tension and vibrating length changed to study the frequency of transverse vibration.
Frequently Asked Questions
Which experiments use the Steel Wire (100gm)?
Searle’s apparatus for Young’s modulus and sonometer work on transverse vibrations, along with general elasticity and material-strength studies.
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