We use a large number of substances in our daily life such as lemon, tamarind, common salt, sugar and vinegar. These substances can be classified into groups based on their physical properties.
Substances can be grouped simply on the basis of their taste also i.e. sweet, salty, sour, or bitter to taste.
Example:
If we squeeze a lemon and taste the juice without adding water or sugar, it will taste extremely sour.
