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Boy, Oh Buoyancy! Water

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Boy, Oh Buoyancy!
Reading Level

	edHelper's suggested reading level:	grades 3 to 4
	Flesch-Kincaid grade level:	5.35

Vocabulary

	challenging words:		afloat, buoyancy, density, displacement, helium, hulls, saltwater, float, freshwater, cargo, boat, water, liquid, holding, high, however
	content words:		Dead Sea, Northern Atlantic Ocean, Plimsoll Line

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Boy, Oh Buoyancy! By Trista L. Pollard

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¹      Float, float water boat,
How high do you float?
Salt water, fresh water, river water, sea,
How high can you float for me?

 
²     So how do ships and people float, anyway? The answers are buoyancy and density. Buoyancy is when an object or being (that includes you) can stay afloat in a liquid (water) or a gas (air). This is why your ice cubes float in your lemonade and helium balloons rise into the air. Density or weight can determine if an object floats or sinks.
 
³     Ice cubes float in water, and warm or hot water will float on top of cold water. Even though cold water is denser than warm water, the ice cubes in your lemonade take up very little space. As a result, the ice cubes will float. When balloons are filled with the gas helium, they rise into the air (if you are not holding them, of course). The helium is less dense than the air that is outside the balloon. If objects are denser, they will sink into the water or will not rise into the air. Now let's talk about people and ships.

Paragraphs 4 to 8:
For the complete story with questions: click here for printable

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