![]() Instruct participants to gently wipe the straw dry with a paper towel and make a distinct thin line for the water mark.Instruct participants to use a permanent marker and mark where the surface of the water touches the side of the straw.If the straw is hitting the bottom of the bottle, either add more water or trim the length of the straw. If not, instruct them to add one nail at a time until in does. Instruct participants to place the straw into the water to check if it floats straight up and down.Instruct participants to place two nails, point side down into the straw. ![]() Instruct participants to make a small ball with the Plasticine and seal one end of the straw so that it is water tight.Instruct the participants to measure and cut the straw to a length of 10 cm.Give each group a cut off water bottle nearly filled to the top with distilled water. Divide participants into groups of three and provide the materials necessary for each participant to make a hydrometer.Instruct participants that they are going to make a device to determine relative density of different liquids.Īssessment: Assessment is on going with verbal responses from participants. Play the video clip that will show how to use a device to check the fluid levels in a car battery. Ask participants, "Do you know how to check your car's battery to insure it is in good working order?" Answers will vary. Show a video of someone trying to start the car, but the battery is dead or relay a story of what that is like.Īsk participants, "Have you ever had a similar experience?" Most will say yes. Antifreeze in car radiators - auto parts store, Wal-Mart, K-Mart.Car batteries - auto parts store, Wal-Mart, K-Mart.Salt water tanks - purchase at pet store or online science catalog. ![]()
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