Question

Is bitter taste physical or chemical?

Answer 1

`"Bitterness"` is probably a chemical property......

Explanation:

See this old answer and links. And thus bitterness probably relates to the `pH`, with `pH>7` giving a soapy, bitter flavour. Note that we commonly drink `"bitter beer"`, in Old Blighty it is common to order to pint of bitter in a pub. Beer, like wine, and cheese, and lemon juice, and most things that taste good, is slightly acidic.....