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.
The buoyancy force on the oil is equal to the weight of that 1 cubic cm of water. Oil is less dense than water, so 1 cubic cm of oil weighs less than 1 cubic cm of water. Therefore, the upward buoyancy force on the oil, which is equal to the weight of water displaced, is greater than the downward force of gravity on the oil, also known as the weight of the oil. This inequality of forces causes the oil to rise in the water. If the oil were denser than the water, the oil's weight (the downward force) would exceed the buoyancy force (the upward force), and the oil would sink in the water.