You probably already know that objects float because they are less dense than water. But have you ever wondered how huge objects like ships, don’t sink? They float, even though they are made from steel, which is denser than water. This is because their hulls are full of air. They will sink into the water until enough water has been moved to match the weight of steel and air in the hull! How high they float will depend on how much they have packed on board. They will also float higher in sea water then fresh water, as salt makes the water dense, and higher in denser cold seas than in warm water. For GCSE Science – you need to be able to explain how the measure the density of regular and irregular objects. It is one of the required practicals you must revise.
Specific Heat Capacity, Resistance (factors affecting resistance), Resistance (in series and parallel circuits), I-V Characteristics and Calculating Density.
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