1 / 17

DENSITY

DENSITY. Density = amount of matter per unit volume. D = m/v (g/cm 3 ) Mass usually expressed in grams Volume usually expressed in cm 3 or ml etc. M ÷ ÷ D X V. Mass =. Density =. Volume =. M V. M D. The “DMV” Triangle for Volume, Mass, and Density. D x V.

liana
Download Presentation

DENSITY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DENSITY • Density = amount of matter per unit volume D = m/v (g/cm3) • Mass usually expressed in grams • Volume usually expressed in cm3 or ml etc.

  2. M ÷ ÷ DXV Mass= Density = Volume= M V M D The “DMV” Triangle forVolume, Mass, and Density DxV

  3. What would take up more space??? A kilogram of feathers…..or a kilogram of steel?? OR

  4. How close the atoms or molecules are to each other More than “heaviness” - density includes how much space an object takes up!! All substances have density including liquids, solids, and gases Density is the measure of the “compactness” of a material

  5. “Compactness”

  6. Gases • How much kinetic energy do the molecules have?? • The greater the kinetic energy • ……the greater the volume • …… and the less dense that gas is!! • Therefore, cold air is more dense than warm air

  7. Low pressure weather system means warmer air tends to rise, High pressure systems indicate a colder more dense air mass that will……. SINK!!!

  8. LIQUIDS • The more dissolved solids in a solution, the more dense (such as ocean water) • Cold water in lakes tend to sink (this creates a constant mixing of water, nutrients, and other substances) • Kinetic energy again!! Denser layers to less dense layers…..

  9. What would happen???? • Mercury density = 13600kg/m3 • Lead density = 11340kg/m3

  10. Lead floats on liquid mercury!

  11. Solids Ice vs. water…..

  12. SOLIDS • Ice is less dense than water (which is why lakes and ponds have a thin layer of ice covering in winter, with water underneath) • Various rocks, woods, metals have a characteristic density specific to that substance Wouldn’t you like to have a bunch of THIS dense material?

  13. Archimedes and the Kings Crown

  14. Factors affecting Density • Temperature • Pressure

  15. Factors affecting Density • Dissolved solids – in liquids • Concentration and kind of substances

  16. DETERMINING DENSITY • Regular Shapes – mass, then determine the volume by formula EX: cubes, cylinders, spheres, cones, etc. • Irregular shapes – mass, then measure displacement of a liquid (usually water) by that irregularly shaped object Use a graduated cylinder Add water to a predetermined level - record. Gently drop in the irregularly shaped object. Read the graduated cylinder – record. Subtract the first water level from the second – this is the volume

  17. Density Table SINK or FLOAT In Water (D = 1.0 g/mL) Float Float Float Sink Sink Sink Float (alcohol) Float (fuel)

More Related