 Scientific experiments often involve making measurements!!!  A measurement includes both a # that identifies how many units there are and a unit of.

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Presentation transcript:

 Scientific experiments often involve making measurements!!!  A measurement includes both a # that identifies how many units there are and a unit of measure.  For example: 6 feet

 THE AMOUNT OF SPACE OCCUPIED BY AN OBJECT IS IT’S VOLUME.  THE BASIC UNIT OF VOLUME IS CUBIC CENTIMETERS OR CM³ FOR SOLIDS  VOLUME = L x W x H

 DENSITY IS A MEASURE OF THE AMOUNT OF MATTER THAT OCCUPIES A GIVEN SPACE.  IT IS CALCULATED BY DIVIDING THE MASS OF THE MATTER BY IT’S VOLUME.  DENSITY= MASS VOLUME

 PROBLEM:  THE BOX BELOW MEASURES 6 METERS BY 10 METERS BY 9 METERS AND WEIGHS 25 GRAMS!  WHAT IS THE DENSITY  FIRST FIGURE OUT THE VOLUME= LENGTH x WIDTH x HEIGHT  SO 6 x 10 x 9 = 50 M³  THE MASS WE ALREADY KNOW = 25 GRAMS  SO DENSITY = MASS/VOLUME  25 GRAMS / 50 M³ =.5 G/CM³  SO THE DENSITY IS.5 G/CM³

“M over D” is remaining so we divide!

“M over V” is remaining so we divide!

“D next to V” is remaining so we multiply!

 DENSITY= MASS VOLUME  DENSITY CAN BE AFFECTED BY TEMPERATURE AND PRESSURE!!!

 AS YOU INCREASE THE DENSITY YOU DECREASE THE TEMPERATURE AND VICE VERSA  EXAMPLE : IN THE SUMMER TIME WE WEAR LESS CLOTHES DENSITY TEMPERATURETEMPERATURE TEMPERATURETEMPERATURE

 AS YOU INCREASE THE PRESSURE YOU INCREASE THE DENSITY AND VICE VERSA  EXAMPLE YOU SQUEEZE A BALLON. THE BALLOON GETS HARDER NOT SOFTER DENSITY PRESSUREPRESSURE PRESSUREPRESSURE

 DENSITY IS A PROPERTY OF A GIVEN SUBSTANCE.  NO MATTER HOW MUCH OR HOW LITTLE OF THAT SUBSTANCE YOU CONSIDER, THE DENSITY OF THE SUBSTANCE WILL ALWAYS BE THE SAME.  ONCE THE MASS OR VOLUME IS CHANGED WHILE THE OTHER STAYS CONSTANT – THE DENSITY WILL CHANGE THUS CHANGING THE OBJECT!!!!!