Question

What is the G-factor in the strain gage, and why do we need to use materials with a high G-factors
in strain gages used for medical purposes.

Answer 1

1. Fractional change is resistance divided by fractional change in length is nothing but G-Factor (Gage factor) which a unitless no. which provides information about the sensitivity upon little change in resistance upon length.

2. We need to use material with a high G-factors in strain gages used for medical purpose is because strain gages are incorporated into instruments such as a syringe, pumps, and kidney dialysis machines. The measurements given by strain gage used to monitor fluid flow rate that's why the use of strain gage on such molecular and complicated purpose results in use of high G-factor in strain gages.