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DENSITY By Sandra Mood DENSITY • https://www.youtube.com/watch?v=dcQR6vV1Sqo WHAT IS DENSITY? Density is a measurement of how solid something is. Specifically it is the mass per unit volume of a substance. If you have two objects of the exact same size (volume), the more dense object will weigh more than the less dense object. DENSITY • https://www.youtube.com/watch?v=5QWXLZ91DUM DENSITY • https://www.youtube.com/watch?v=KMNwXUCXLdk SO THERE ARE TWO THINGS CONTRIBUTING TO DENSITY : 1.The mass of the atoms or molecules that makes up the material. 2.The volume or amount of space the material takes up. If the molecules or atoms are “packed” in more closely, it will be more dense. FOR EXAMPLE, STYROFOAM IS A LOW DENSITY MATERIAL. EVEN A LARGE STYROFOAM CONTAINER DOES NOT WEIGH MUCH. THE MOLECULES IN THE STYROFOAM DO NOT HAVE MUCH MASS AND THERE IS A LOT OF SPACE BETWEEN THEM. A BRICK, ON THE OTHER HAND, IS MUCH MORE DENSE. EVEN A MODERATE SIZED BRICK CAN BE PRETTY HEAVY. THIS IS BECAUSE THE MOLECULES WHICH MAKE UP THE ROCK HAVE MORE MASS AND ARE PACKED MORE CLOSELY TOGETHER. WHICH HAS A GREATER DENSITY1KG OF WATER OR 10 KG OF WATER? The density of any amount of water is the same: This means that the ratio of mass/volume is the same for any amount of water. WHICH HAS A GREATER DENSITY-5 KG OF LEAD OR 10 KG OF ALUMINUM? Since density is a ratio of weight or mass per volume, and the ratio is greater for any amount of lead that for any amount of aluminum. WHICH HAS THE GREATER DENSITY-AN ENTIRE CANDY BAR OR HALF A CANDY BAR? Both the half and the full candy bar have the same density. WHAT HAPPENS TO THE VOLUME OF A LOAF OF BREAD THAT IS SQUEEZED? • What happens to the mass? • What happens to the density?