How does tom's presence affect the atmosphere of the party?

Tom's presence makes the party feel awkward. This is because Gatsby wants Tom to leave her and come back to him as if there was nothing wrong in the last 5 years. But Gatsby failed because Nick told him that he cannot repeat what happened in the past.

Tom's presence makes the party's atmosphere awkward.

Tom is a character in a novel gatsby, he is a solid, straw-haired man of thirty with a somewhat hard mouth and a supercilious way. Two sparkling, haughty eyes had set up strength over his face, and gave him the presence of continually inclining forcefully forward-you could see an incredible pack of muscle moving when his shoulder moved under his thin coat.