My question is this:
If one was to say "I'm going to soak in a hot tub" isn't that different then saying "I'm going to soak in the hot tub"?
I feel that it is, as one implies that you will be in a "hot tub" and the other a tub fill with hot water.
I just don't know what the difference is. If someone could explain, I would appreciate it very much.