11) if you place two wood blocks in water and one sinks while the other floats what do you know about the densities of the blocks

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mlsiasebs's profile pic

mlsiasebs | College Teacher | (Level 1) Associate Educator

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When comparing objects that float or sink in a particular liquid, we can determine something about the relative density of the objects and/or the liquid.  The density of water is approximately 1 g/mL.  Any object that floats in water will have a density less than water and the density of an object that sinks in water will have a density greater than that of water. 

We could further narrow down the range of possible density values of the blocks by placing them in different liquids to see if they floated or sank.    For example, ethanol has a density of 0.789 g/ml.  If the block that sank in water (i.e. density less than 1) floated in ethanol, we would know that the density of the wood block is between 0.789 g/mL and 1 g/mL.

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najm1947's profile pic

najm1947 | Elementary School Teacher | (Level 1) Valedictorian

Posted on

Some typograhical mistake in ANSWER 1 para 2.

For example, ethanol has a density of 0.789 g/ml.  If the block that sank in water (i.e. density less than 1) floated in ethanol, we would know that the density of the wood block is between 0.789 g/mL and 1 g/mL.

That sank in water is to be read as that floated in water   

pranitingale's profile pic

pranitingale | Student, Grade 9 | (Level 1) Valedictorian

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The thing is relative density ... ¤ Any object having more density than the liquid in which it is immersed sinks down.. ¤ Relative density = density of object / density of water ¤ relative density has no S.I unit.

najm1947's profile pic

najm1947 | Elementary School Teacher | (Level 1) Valedictorian

Posted on

Some typograhical mistake in ANSWER 1 para 2.

For example, ethanol has a density of 0.789 g/ml.  If the block that sank in water (i.e. density less than 1) floated in ethanol, we would know that the density of the wood block is between 0.789 g/mL and 1 g/mL.

For example, ethanol has a density of 0.789 g/ml.  If the block that floated in water (i.e. density less than 1) sank in ethanol, we would know that the density of the wood block is between 0.789 g/mL and 1 g/mL.

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