acid. ;D
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A lemon has a sour taste and may squeak when rubbed due to the friction between your fingers and the smooth surface of the lemon's peel.
You taste lactic acid when the milk becomes sour. Acids, in general, sour.
Sour taste is a sensory perception that results from the detection of acids in food. It is a chemical reaction that occurs when acidic compounds in food come into contact with taste receptors on the tongue, triggering signals to the brain that are interpreted as sour taste.
When sour food enters the mouth, taste receptors on the tongue send signals to the brain, which interprets this sensation as sour. This usually triggers salivation in an attempt to dilute and neutralize the acidity in the mouth. Additionally, the sour taste can stimulate taste buds and increase sensory perception.
Acids taste sour, alkaline substances taste bitter.
The four sensations of taste are sweet, sour, salty, and bitter. These sensations are detected by taste buds on the tongue.