dråper

Dråper are small volumes of liquid that separate from a larger body, held together by surface tension and cohesive forces. They form when a portion of liquid is pinched off, or when a liquid is emitted as a mist or spray. In the absence of strong air resistance, droplets tend toward a spherical shape; larger droplets become flattened by air drag and may break apart.

Dråper occur widely in nature and daily life. Natural examples include rain, dew or fog droplets, and tear droplets in the eye. They also appear in industrial and technological contexts, such as in sprays, atomizers, inkjet printing, and inhalers, where liquids are emitted as fine or coarse droplets.

The size of a drop varies greatly. Dråper can range from micrometers in aerosol and spray applications to millimeters in rain and condensation. Typical raindrops measure roughly 0.5 to 5 millimeters in diameter, while dew and fog droplets are usually much smaller. The behavior of droplets depends on surface tension, viscosity, air velocity, and environmental conditions, influencing their shape, fall rate, and evaporation.

In science and technology, droplets are central to studies of fluid dynamics, mass transfer, and spray engineering. Droplet size distribution, formation mechanisms, and evaporation rates are key parameters in applications from agriculture and medicine to coating and printing. Understanding dråper helps explain phenomena from weather patterns to consumer products.

See also: droplets, surface tension, aerosols.