Atoms can exist on their own or together as molecules. Matter is made up of small particles called atoms. Try mixing oil and water and see how they separate into layers, with the less dense oil on top. GCSE Edexcel Density of materials - Edexcel Required practical - how to calculate density. When you mix two or more substances, the most dense substance sinks to the bottom, whilst the least dense substance is more buoyant and floats to the top. This is why you should never comment on your Auntie Mabel's sponge cake by describing it as dense: she was probably going for something a little more airy.ĭensity is also what makes things float or sink. A pound of feathers is filled with airy space, so it's not very dense at all, while a pound of lead feels much more solid, so it's more dense. The density of water is 1.940 sl/ft at 39 F (4 C), and the specific weight in Imperial units is 1.940 sl/ft 32.174 ft/s 1.940 lb / ( ft/s ft ) 32.174 ft/s 62.4 lb The calculator below can be used to calculate the liquid water density at given temperatures. For an equal amount of space it takes up (volume), lead weighs much more than the feathers (mass).ĭensity can also be thought of as how compacted or compressed a substance is. Note: We are purposely using the terms size and. Density is a characteristic property of a substance and doesn’t depend on the amount of substance. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Lakes and rivers rarely freeze completely, and the liquid water below can become a winter refuge for aquatic life. Density is a measure of how heavy something is compared to its size. Ice, water’s solid phase, is more buoyant, so it forms at the surface of water bodies and freezes downward. So if the question was, 'Which weighs more: a 500ml jug full of feathers or a 500ml jug full of lead?' then the answer would be the lead. Water’s density is greatest at about 4 C (39.2 F), in the liquid phase. What is density?ĭensity is the mass per volume - not just the straight-up mass. Read on to find out exactly what density is, how it works, and how to calculate density. Although the feathers and the lead both weigh exactly the same (um, a pound), their density is wildly different, and we can sometimes mentally conflate weight and density - even though they're different concepts. If you've ever been fooled by the old question, ' Which weighs more: a pound of feathers or a pound of lead?' then you wouldn't be alone. To calculate density: ρ = m/V To calculate mass: m = ρV To calculate volume: V = m/ρ
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |