In physics, a paste is a substance that behaves as a solid until a sufficiently large load or stress is applied, at which point it flows like a fluid. In rheological terms, a paste is an example of a Bingham plastic fluid.
Pastes typically consist of a suspension of granular material in a background fluid. The individual grains are jammed together like sand on a beach, forming a disordered, glassy or amorphous structure, and giving pastes their solid-like character. It is this "jamming together" that gives pastes some of their most unusual properties; this causes paste to demonstrate properties of fragile matter.
In pharmacology, paste is basic pharmaceutical form. It consists of fatty base (e.g., petroleum jelly) and at least 25% solid substance (e.g., zinc oxide).
Examples include starch pastes, toothpaste, mustard, and putty.
Famous quotes containing the word paste:
“In a thousand apparently humble ways men busy themselves to make some right take the place of some wrong,—if it is only to make a better paste blacking,—and they are themselves so much the better morally for it.”
—Henry David Thoreau (1817–1862)