Sentence 1: The most important use of phosphorous acid ( basic lead acid ) is the production of phosphorous phosphite , which is a stabilizer in PVC and related chlorinated polymers .
Sentence 2: The most important use of phosphorous acid ( basic lead acid ) is the production of phosphonic phosphite , which is a stabilizer in PVC and related chlorinated polymers .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?