Judging Purity of Market Products:

• Common perception of purity: No adulteration in consumables like milk, ghee, butter, salt, spices, mineral water, or juice.
• Scientific view: These items are mixtures, not pure substances.

Understanding Purity:

• Common definition: Pure means no adulteration.
• Scientific definition: Pure means consisting of only one type of particle with uniform chemical nature.

Examples:

• Milk: A mixture of water, fat, proteins, etc.
• Pure substance (scientific): A single type of matter with uniform particles.

Observation:

• Most matter around us, like sea water, minerals, and soil, is a mixture of two or more pure components.