A substance with a pH less than 7

An acid

Explanation:

On the pH scale, 7 is neutral, or the pH of pure water. Any substance with a pH of lower than 7 is an acid, while anything with a pH of higher than 7 is a base. The pH scale is measured logarithmically, meaning that each step up is 10 times more powerfully either base or acidic, whichever side it was on.

no, i was listening to water by schoolboy q while and i saw this question

explenation:

water isn't wet. wetness is a description of our experience of water; what happens to us when we come into contact with water in such a way that it impinges on our state of being. we, or our possessions, 'get wet'. a less impinging sense experience of water is that it is cold or warm, while visual experience tells us that it is green or blue or muddy or fast-flowing. we learn by experience that a sensation of wetness is associated with water: 'there must be a leak/i must have sat in something.'

l dont know l am s sorry