DENSITY Density a measure of the concentration of matter (MASS) in a given space. Example: a block of foam, block of wood, block concrete All the same size but the weight is different. The heavier object has molecules packed closer together.   A B C   xxxx xxxx xxxx

DENSITY Density a measure of the concentration of matter (MASS) in a given space. xxxx xxxx xxxx   A B C B is greater than A – More molecules C is greater than A – More mass/ more molecules C has the Highest Density because it is a large mass in a small volume. Density is defined as the mass per unit volume of a sample of matter 3 g/cm

Density Formula Mass D = Volume Volume = length X Width X height cm 3 How can we find out the volume of these aluminum bars? Volume = length X Width X height   cm 3

How can you find the volume of an irregular shaped object? Water displacement method

Remember one cubic centimeter = 1 mL IN THE  METRIC SYSTEM, ONE CUBIC CENTIMETER OF WATER,  WEIGHS EXACTLY 1 GRAM. AND THEREFORE , ONE LITER OF WATER,  WEIGHS 1000 GRAMS, 1,000 GRAMS IS ALSO CALLED A KILOGRAM, BECAUSE, THE PREFIX KILO- MEANS 1,000 OF... YOU SHOULD ALSO KNOW THAT,  1 MILLILITER or 1 / 1000 OF A LITER OF WATER, WEIGHS 1 GRAM

DENSITY and TEMPERATURE Hot air Balloon: What does this demo show? http://video.yahoo.com/video/play?vid=198980&fr=yfp-t-471 http://www.metacafe.com/watch/211734/hot_air_balloon_accident/ http://video.yahoo.com/video/play?vid=12602&fr=yfp-t-471

                                                              

Change in Temperature causes a change in volume, which affects density. As the volume of a gas or liquid__________, and the mass remains the same, the density________ . increases decreases As the volume of a gas or liquid decreases, and the mass remains the same, the density increases. Change in temperature causes atmospheric and ocean currents

NATURE of WATER Most materials are densest in the solid state. Water is most dense as a liquid when the temperature is 4ºC

What significance does this behavior of water have when a lake freezes?

Traditional Inuit (Eskimo) ice fishing near Pond Inlet, Baffin Island, Nunavut, Can.

DENSITY GRAPHS   density mass   volume size

DENSITY GRAPHS density     pressure Density Temperature