Two substance useful because of their viscosity

Viscosity is the measure of a fluid's resistance to flow. It describes how thick or thin a fluid is. Two substances that are useful specifically because of their viscosity are motor oil and honey.

1. Motor oil: Motor oil is used in engines to lubricate the moving parts, reduce friction, and help dissipate heat. Its viscosity is critical because it needs to be thick enough to maintain a lubricating film between engine components under high pressure and temperature, yet thin enough to flow smoothly when the engine is cold at startup. Multigrade motor oils are designed to have a suitable viscosity across a broad temperature range.

2. Honey: Honey is known for its high viscosity, which gives it a slow flow. This property is particularly useful for culinary applications as it allows honey to stay on or coat foods effectively, enhancing flavors and adding moisture. The antimicrobial properties of honey are also related to its viscosity because it helps to create a protective barrier on wounds when used as a natural remedy.