Answer / valluri066

Acceleration caused by gravity is called G-force and expressed in G's,

A man in rocket travelling against gravitational (into sky) experiences extra body weight or simply extra 'g'

And if he jumps from that rocket (free falling) he feels no weight or simply 0-g's

Answer / m.r.marashi

by accelerometer

Answer / valluri066

G's or G-force can be easily measured using Accelerometers.

Piezo electric type Accelerometer and damped mass and spring assembly Accelerometers are most commonly used.

Answer / swadish k

using gas detectors
for eg: dragers gas detectors

Answer / jobby c johnson

g sensors are available to measure g's

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