Whose soul is sense meaning?
Similarly, you may ask, what does Sublunary lovers mean?
These "dull, sublunary lovers" (which literally means sub-lunary, or below the moon, or terrestrial—these lovers are earthly, whereas Donne and his wife know a heavenly sort of love) cannot allow a lover to leave because their love is entirely based around the other person's presence.
Likewise, how does the love the speaker feels differ from dull sublunary lovers love? Dull sublunary lovers' love (Whose soul is sense) cannot admit Absence, because it doth remove Those things which elemented it. The love the speaker feels has more to do with the mind. The love the speaker feels has more to do with the eyes.
Subsequently, one may also ask, what does like gold to airy thinness beat mean?
Like gold to airy thinness beat. The poem is about how close their two souls are and the thinness of the gold is how brief/insubstantial the separation between them will be when he dies first.
What is a sigh tempest?
The metaphors in line 6, though, keep us in nature, but move us to natural disasters: "tear-floods" and "sigh-tempests." These are hyperboles, or exaggerations, like "cry me a river." This hyphenated description is also commonly referred to as an epithet or a kenning.