Tilt two jars and the difference is obvious. Water races out in a thin stream. Honey crawls down the side in a thick golden rope. Both are liquids, both obey gravity, yet one flows far faster. The reason is viscosity: a fluid's internal resistance to flow. Viscous fluids fight motion from the inside. Molecules and tiny layers rub against each other as they slide past, creating friction you cannot see but can definitely feel when you stir. Higher viscosity means a thicker, slower-pouring liquid. Lower viscosity means a runnier fluid that flows easily.
🍯 VISCOSITY
Viscosity measures how strongly a fluid resists flowing. Thick honey has high viscosity. Thin water has low viscosity.