Original sentence: All materials have temperature dependent variations in stress related properties, and non-newtonian materials have rate-dependent variations.Laboratory test are usually performed on material samples in order to determine the yield strength and the ultimate strength that the material can withstand before failure.Solids, liquids and gases have stress fields
Edited sentence: All materials have temperature dependent variations in stress related properties, and non-Newtonian materials have rate-dependent variations.Laboratory tests are usually performed on material samples in order to determine the yield strength and the ultimate strength that the material can withstand before failure.Solids, liquids, and gases have stress fields