James Watt was an inventor as opposed to an actual scientist. Pascal's greatest contributions were in pure mathematics, not in physical sciences.
My top ten physicists, in chronological order: Archimedes, Copernicus, Galileo, Newton, Faraday, Maxwell, Rutherford, Einstein, Fermi, Heisenberg.
Pascal came up with Pressure equation P= F/A and the universal unit for pressure is Pascal. He is one of the greatest physicists of all times.