tension; tensile force
Technical term in physics and engineering for the pulling force transmitted through a string, cable, chain, or similar object.
Measure the tension of the wire.
This material can withstand high tensile force.
張力 is the precise physics term for tension in a material, whereas 引っ張り is a general, everyday noun for pulling or stretching.
張り is the everyday word for tautness or firmness, while 張力 is a technical physics term for the specific pulling force of tension.
Compound of 張 (stretch, spread) and 力 (force, power). The reading is on'yomi.