In statements of generic truth like "water boils," does it entail statements like "water exists"? If I describe something not real, am I saying something false? For example,
Dragons have wings.
Since dragons don't exist, the above statement would be false if generic truths like "dragons have wings" entail "dragons exist." However, portrayals of dragons often show them with wings, so it feels very strange to think of the statement "dragons have wings" as false, and I am at a loss on if I should think of a sentence describing something nonexistent as true or false. The sentence is the same structure as "elephants have trunks" which has a link that states "Such statements are true in the past, present, and future--as long as elephants exist." There are still other sentences that trouble me on whether people would consider them true or false.
Things stop moving at absolute zero.
Absolute zero is impossible to reach, so would this be considered false?
What confuses me about these generic truths is that I'm not sure where, when, and what situation they occur since wikipedia said this about the gnomic aspect.
Used to describe an aspect, the gnomic is considered neutral by not limiting the flow of time to any particular conception (for example, the conceptions of time as continuous, habitual, perfective, etc.). Used to describe a mood, the gnomic is considered neutral by not limiting the expression of words to the speaker's attitude toward them (e.g. as indicative, subjunctive, potential, etc.). Used to describe a tense, the gnomic is considered neutral by not limiting action, in particular, to the past, present, or future. Examples of the gnomic include such generic statements as: "birds fly"; "sugar is sweet"; and "a mother can always tell".
So if I made sentences like
I have a heater that has never been heated and will never heat.
I have a machine that heats that has never heated and will never heat.
The machine I described does heat, but that doesn't happen in past, present, or future, so when does it heat? I know that present tense can be used to describe imaginary situations like stories, but the context of my sample sentence is that of a heater that does exist. I could say that the context omits a clause like "If used...heats", but that would make the sentence a conditional, and "I have a machine that heats that has never heated and will never heat" is not a conditional.