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INV. 6 (PART 3)

INV. 6 (PART 3). CONDENSATION AND DEW POINT. REVIEW. HOW DO YOU KNOW THAT THERE IS WATER VAPOR IN THE AIR? WHAT DID YOU DO TO GET WATER VAPOR TO CONDENSE? WAS HEAT TRANSFER INVOLVED IN THE CONDENSATION PROCESS?. PONDER/INQUIRE. IS THERE A TEMPERATURE AT WHICH CONDENSATION STARTS TO HAPPEN?

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INV. 6 (PART 3)

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  1. INV. 6 (PART 3) CONDENSATION AND DEW POINT

  2. REVIEW • HOW DO YOU KNOW THAT THERE IS WATER VAPOR IN THE AIR? • WHAT DID YOU DO TO GET WATER VAPOR TO CONDENSE? • WAS HEAT TRANSFER INVOLVED IN THE CONDENSATION PROCESS?

  3. PONDER/INQUIRE • IS THERE A TEMPERATURE AT WHICH CONDENSATION STARTS TO HAPPEN? • WILL CONDENSATION TAKE PLACE AT ANY TEMPERATURE IF YOU ALLOW ENOUGH TIME FOR ENERGY TRANSFER TO OCCUR? • DISCUSS THESE 2 QUESTIONS WITH A PARTNER.

  4. PROCEDURE • FOLLOW THE INSTUCTIONS • 1. RECORD THE TEMPERATURE OF A HALF CUP OF WATER. • ADD 1 ICE CUBE. STIR CAREFULLY WITH A THERMOMETER. • MONITER THE TEMPERATURE. • IF ICE MELTS ADD ANOTHER ICE CUBE, ONE AT A TIME UNTIL YOU SEE FOG FORM ON THE SIDE OF THE CUP.

  5. PROCEDURE CONT. • REMOVE ICE CUBES THE MOMENT YOU SEE CONDENSATION ON THE CUP. • RECORD THE TEMPERATURE AT WHICH CONDENSATION FIRST OCCURRED. • POUR THE WATER INTO AN EMPTY DRY CUP. WATCH TO SEE IF CONDENSATION FORMS. IF IT DOESN’T RECORD THE TEMP.

  6. PROCEDURE CONT. • IF FOG DOES OCCUR, CONTINUE TO POUR WATER BACK AND FORTH UNTIL NO FOG FORMS ON THE CUP. • RECORD THE HIGHEST TEMPERATURE AT WHICH CONDENSATION OCCURRED. • SET UP A RECORDING CHART.

  7. CONDENSATION CHART

  8. REPORT RESULTS • WHEN FINISHED RECORDING INFORMATION ON THE CHART, WRITE YOUR GROUPS HIGHEST TEMPERATURE AT WHICH CONDENSATION FORMS. • ONCE ALL TEMPERATURES ARE RECORDED ON THE BOARD, CALCULATE THE AVERAGE TEMPERATURE AT WHICH WATER VAPOR CONDENSES. • RECORD THE TEMPERATURE ON YOUR CHART.

  9. DEW POINT • SOME PEOPLE REFER TO THE CONDENSATION ON THE SIDE OF THE GLASS AS DEW. • WHAT IS DEW? • HOW DOES DEW FORM?

  10. DEFINITION • DEW POINT - IS THE TEMPERATURE AT WHICH AIR IS SATURATED.

  11. DEW POINT QUESTIONS • OPEN TO PAGE 35 “DEW POINT QUESTIONS” IN YOUR LAB BOOK. • WORK BY YOURSELF TO ANSWER THE QUESTIONS.

  12. THERMOMETERS • ONE WAY RELATIVE HUMIDITY CAN BE DETERMINED IS BY COMPARING THE TEMPERATURE OF THE AIR AND THE TEMPERATURE OF A PIECE OF WET CLOTH. THESE ARE CALLED DRY-BULB AND WET-BULB READINGS. • WHAT HAPPENED WHEN WE WET THE FABRIC ON THE WET-BULB THERMOMETER AND WAVED IT IN THE AIR?

  13. DEMONSTRATION • I WILL CONDUCT AN EXPERIMENT JUST LIKE YOU DID EARLIER. • THIS TIME WE WILL FIGURE OUT RELATIVE HUMIDITY.

  14. CALCULATIONS • AFTER FIVE MINUTES OF WAVING THE THERMOMETERS, RECORD THE TEMPERATURES. • TURN TO PAGE 79 IN THE RESOURCE BOOK “HUMIDITY CALCULATOR”.

  15. CALCULATIONS CONT. • SUBTRACT THE WET-BULB TEMPERATURE FROM THE DRY-BULB TEMPERATURE TO DETERMINE THE DIFFERENCE. • FIND THE DRY-BULB TEMPERATURE ON THE LEFT COLUMN OF THE CHART. • FIND THE TEMPERATURE DIFFERENCE IN THE ROW ACROSS THE TOP OF THE CHART. • FIND THE SQUARE WHERE THE TWO READINGS INTERSECT. THIS IS THE RELATIVE HUMIDITY.

  16. READING • READ PAGE 34 IN RESOURCE BOOK “ DRAGON’S BREATH” • ANSWER THE QUESTIONS THAT FOLLOW.

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