What are the units for Young's Modulus in GPa?

AI Thread Summary
Young's Modulus is expressed in gigapascals (GPa), which is a unit of pressure equivalent to 10^9 pascals. Stress is measured in kilonewtons per square meter (kN/m²), which is also equivalent to kilopascals (kPa). Since strain is dimensionless, Young's Modulus can indeed be calculated as stress divided by strain, resulting in units of kN/m² or GPa. Therefore, the confusion arises from the conversion between these units, where 1 GPa equals 1,000,000 kPa. Understanding these conversions clarifies the use of GPa in product specifications for materials.
robsmith82
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I seem to be going a bit brain dead here, but in youngs modulus, how are the units in GPa as they are in one of my product specs I've just received?

Lets say we have stress in kN/m^2 and strain has no units, then surely E should be in kN/m^2?
 
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Pressure is measured in Pascals, and Pressure is defined as a force per unit area. So, a Pascal is really one Newton per unit area: N/m^2, for instance. So, kN/m^2 = kPa, which of course is just 10^6 GPa.
 
Doh.

Thanks!
 
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