DENSITY Density amount of matter per unit volume
- Slides: 17
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.
The “DMV” Triangle for Volume, Mass, and Density = M V Volume = M D Mass = D x V M ÷ ÷ D X V
What would take up more space? ? ? kilogram of feathers…. . or a kilogram of steel? ? OR A
Density is the measure of the “compactness” of a material n. How close the atoms or molecules are to each other n. More than “heaviness” - density includes how much space an object takes up!! n. All substances have density including liquids, solids, and gases
“Compactness”
Gases n. How much kinetic energy do the molecules have? ? n. The greater the kinetic energy n ……the greater the volume n …… and the less dense that gas is!! n. Therefore, cold air is more dense than warm air n
Low pressure weather system means warmer air tends to rise, High pressure systems indicate a colder more dense air mass that will……. SINK!!!
LIQUIDS n The more dissolved solids in a solution, the more dense (such as ocean water) n 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…. .
What would happen? ? n Mercury density = 13600 kg/m 3 n Lead density = 11340 kg/m 3
Lead floats on liquid mercury!
Solids Ice vs. water…. .
SOLIDS n Ice is less dense than water (which is why lakes and ponds have a thin layer of ice covering in winter, with water underneath) n Various rocks, woods, metals have a characteristic density specific to that substance Wouldn’t you like to have a bunch of THIS dense material?
Archimedes and the Kings Crown
Factors affecting Density n Temperature n Pressure
Factors affecting Density n Dissolved solids – in liquids n Concentration and kind of substances
DETERMINING DENSITY n Regular Shapes – mass, then determine the volume by formula EX: cubes, cylinders, spheres, cones, etc. n Irregular shapes – mass, then measure displacement of a liquid (usually water) by that irregularly shaped object 1. Use a graduated cylinder 2. Add water to a predetermined level - record. 3. Gently drop in the irregularly shaped object. 4. Read the graduated cylinder – record. 5. Subtract the first water level from the second – this is the volume
Density Table SINK or FLOAT In Water (D = 1. 0 g/m. L) Float Sink (alcohol) Float (fuel) Float
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- What is distance covered per unit of time
- Mass of a substance per unit volume
- What is the mass per unit of volume
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- Dmv triangle chemistry
- Section 1 composition of matter
- Grey matter reliaquest
- Section 1 composition of matter
- Chapter 2 section 1 classifying matter answer key
- Gray matter and white matter
- Classification of matter section 1 composition of matter
- Gray matter and white matter
- Pallium telencephalon
- Energy naturally flows from warmer matter to cooler matter.