At the very top it should have a slightly darker spot. Using the permanent marker, carefully make a small spot in the center of the darker spot. Then take a cloth tape measure or use a piece of string and a regular tape measure or ruler and carefully make two small lines with the permanent marker at the top of the balloon that are two and one half inches away from one another, with the darker spot as the midpoint.
To do this you can center the tape measure so that its one-and-one-quarter-inch mark is on the small spot you made and then make a line at the zero and two-and-one-half-inch points. Repeat this with the other balloon so that it also has lines that are two and one half inches apart on its top. For example, the distance might be two and three eighths inches or two and five eighths inches. Put balloon number 1 in the freezer in the area you cleared out for it.
Leave it in the freezer for 45 minutes. Do not disturb it or open the freezer during this time. How do you think the size of the balloon will change from being in the freezer? During this time, leave balloon number 2 somewhere out at room temperature not in direct sunlight or near a hot lamp.
After balloon number 1 has been in the freezer for 45 minutes, bring your cloth tape measure or piece of string and regular tape measure to the freezer and, with the balloon still in the freezer but with the freezer door open to let you access the balloon , quickly measure the distance between the two lines as you did before. Did the distance between the two lines change? If so, how did it change? What does this tell you about whether the size of the balloon changed?
Why do you think this is? Then measure the distance between the two lines on balloon number 2, which stayed at room temperature. Overall, how did the balloon change size when placed in the freezer? What do your results tell you about how gases expand and contract as temperature changes? Extra: After taking balloon number 1 out of the freezer leave it at room temperature for at least 45 minutes to let it warm up.
Then remeasure the distance between the lines. How has the balloon changed size after warming up, if it changed at all? Extra: Try this activity again but instead of putting balloon number 1 in the freezer, put it in a hot place for 45 minutes, such as outdoors on a hot day or inside a car on a warm day. Just make sure the balloon is not in direct sunlight or near a hot lamp, as this can deflate the balloon by letting the gas escape.
Does the balloon change size when put in a hot place? If so, how? When substances expand or contract, their particles stay the same size. It is the space between the particles that changes:. Remember, the particles themselves never expand. Expansion and contraction Substances expand increase in size when they get warmer, and they contract decrease in size when they get cooler. For example: Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.
David Drayer. Dec 8, Explanation: As the molecules of a liquid are cooled they slow down. Related questions What are physical properties of liquids? What are some examples of properties of solids? What are some examples of properties of liquids?
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