By Andreas Antoniou, Wu-Sheng Lu
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Ships float because even when loaded, much of their volume is filled with relatively light cargo and a lot of air space and so their average density is less than that of sea water. Buoyancy is also affected by the density of seawater, which varies considerably around the world. In Bombay the sea is more salty than it is near Britain so ships ride higher in the water in Bombay. If a ship is loaded with cargo in Bombay and is bound for London, as it nears the UK it will lie much lower in the water and this could be dangerous if it is overloaded.
This is 48 Hydrostatics: water at rest because the weight of the water displaced by the cork is greater than the weight of the cork itself and so the cork rises under the unbalanced force. Once at the surface the weight of the cork is balanced by the lifting effect of the water. In this case the water displaced by the cork is not a measure of its volume but a measure of its weight. Another way of determining if an object will float is to measure its density. When the density is less than that of water it will float.
For convenience I bar pressure is rounded off to 100 kN/m2. A more commonly used term in meteorology is the millibar. 5 bar. Calculate the pressure in metres head of water. 11 Gauge and absolute pressures. 1 Gauge and absolute pressures Pressure measuring devices work in the atmosphere with normal atmospheric pressure all around them. Rather than add atmospheric pressure each time a measurement is made it is common practice to assume that atmospheric pressure is equal to zero and so it becomes the base line (or zero point) from which all pressure measurements are made.