Title: Floating Objects and Density Objective: You will investigate how density affects floating or sinking of an object in water Apparatus: egg, graduated cylinder, salt, aquarium, aluminum cube, wood cube, balance. Background Theory: When an object is placed in water, it may float or sink. A cube of metal such as iron or aluminum sinks while a block of wood floats. Density of an object is defined as mass divided by volume. If density of an object is greater than the density of water, it sinks. Experimental Method: 1. Measure mass of an aluminum cube and equal mass of wood. Compare the density of aluminum and wood. Which one has greater density? How much greater is it? Which one floats and sinks in water? 2. Place diet coke and regular coke in water. Which one floats and doesn't float? What makes the difference between floating and sinking of soda bottle? Read the labels and compare contents in the soda cans. Compare density of regular soda and diet soda with the density of water. Try with other regular and diet soda cans. What happens? 3. Measure mass of an egg. Measure the volume of the egg with a graduated cylinder. Calculate density of the egg. Is density of egg bigger or smaller than the density of water? Does the egg float or sink in water? 4. How can you make the egg to float in water? Dissolve salt in 500mL of water until an egg floats in water. How many grams of salt is used in water? What is density of salt water? Between densities of salt water and egg, which one is bigger? Data: 1 2 3 4 Observation Questions: 1. What makes it easy to swim in the Red Sea? 2. What planet in our solar system can float in water?