Weekly Weather Report for Luzern, Switzerland. Looking at the weather in Luzern, Switzerland over the next 7 days, the maximum temperature will be 23â (or 73â) on Sunday 9th April at around 1 pm. In the same week the minimum temperature will be -2â (or 28â) on Friday 7th April at around 4 am.
The forces at work in buoyancy. Note that the object is floating because the upward force of buoyancy is equal to the downward force of gravity. In science, buoyancy ( /ËbÉÉª.Énsi, -Éntsi/ or /ËbuËjÉnsi, -jÉntsi/;) or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.
In order to control buoyancy, the submarine relies on special tanks that can be filled with water or air. To return to the surface, the tanks are filled with air. This makes the submarine less dense than the water around it, causing the sub to float to the surface.