A sprayer or atomizer (also, spray or sprayer) is a device used to produce a fine spray of a liquid, using a manual pump (rubber bulb or plunger), based on aspiration due to the Venturi effect.

When pressurized air is injected through a tube that decreases in section, it undergoes a velocity, which reduces the pressure at the narrowest point (due to Bernoulli's principle).

The reduced pressure absorbs, through a narrow tube, the liquid from the lower container (in fact it can be in any position as long as the liquid reaches the orifice), due to the pressure difference between the two points, and projects it forward in the form of a fine rain of small droplets (not atoms despite the name).

Atomizers are used for spraying perfumes, for paint application, in carburetors and fuel injection systems, in ironing and spray drying facilities, among other applications. During the COVID-19 pandemic, its use has become widespread for applying alcohol to the hands.