Usage patterns
〈物〉の強度が高いthe strength of something is high
This metal has high strength.
強度の〈事〉severe/extreme (a condition or trait)
He has severe myopia, so glasses are indispensable.
強度を測るto measure the strength (of something)
They conducted a test to measure the bridge's strength.
強度を上げるto increase the strength (of something)
They added more rebar to increase the strength.