There are two forces acting on the life jacket - its weight ... Things that float are buoyant. If the weight is greater than the upthrust, it sinks.

As a bubble grows, it is pulled upwards and stretched by buoyant forces. Surface tension acts to thin down the thread of air linking the bubble to the nozzle until finally its radius, at a point ...

This generates an upward (buoyant) force on the air, as it is lighter than an equal volume of unheated air. Since most sunlight penetrates to the ground, during the day air near the ground is ...

Buoyancy is an upward force in a fluid (any flowing substance, including air) exerted on all bodies within it. The force comes from the pressure within the fluid being greater the further down in ...