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Sink or Float? - somervillepublic.com

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What makes something float ? You might be tempted to say that whether or not something floats depends on how heavy it is. But, you d only be partially right. Think about cruise ships they can weigh tens of thousands of tons, but still float . That s because floating or sinking isn t just about how heavy something is. It s about how heavy something is compared to the same amount (volume) of water. This ratio of an object s mass to its volume is known as density. Density is what really determines whether something will sink or float . In this activity, you will use an object called a density ball to explore how temperature can affect the density of different materials and affect whether an object will sink or float in water. What You Need Hot tap water (125 -130 Fahrenheit) 2000 ml beaker 1 Density Ball Ice cubes Go Temp Probe Sink or float ?

The Experiment 1. Fill the beaker with 1250 ml of hot (approximately 125˚F) tap water. Place the Go Temp probe in the water along the side of the beaker.

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