Knowing that gravitational acceleration is 9.81 m/s2, calculate the specific weight of water at 10 C. What does specific gravity mean and just want to pause here and say specific gravity is also very often called a relative density okay that's it that's it let's continue the specific gravity of an object is the density of that object divided by the density of water the density of water is 1,000 kilograms per meter cubed for instance the density of gold is 19300 kilograms per meter cubed so the specific gravity of gold is 19.3 the density of ketchup is 1,400 kilograms per meter cubed so the specific gravity of ketchup is 1.4 note there's no units for specific gravity because it's the ratio of one density to another density so the units cancel each other out okay so why even bother defining something called the specific gravity well one really cool thing about specific gravity is that for something that floats the specific gravity tells you the fraction of that object that will be below the water while it's floating for instance say you let a cube of wood with specific gravity zero point to float in water since the specific gravity is zero point two that means that 20% of the total volume of this wood is gonna be submerged below the water while it's floating if the cube of wood had a specific gravity of zero point six sixty percent of the wood would be submerged beneath the water's surface ice has a density of about nine hundred and twenty kilograms per meter cubed that means ice has a specific gravity of 0. The density of water at 10 C is 999.75 kg/m3.
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