INV. 6 (PART 3)INV. 6 (PART 3)

CONDENSATION AND DEW CONDENSATION AND DEW POINTPOINT

REVIEWREVIEW

HOW DO YOU KNOW THAT THERE IS HOW DO YOU KNOW THAT THERE IS WATER VAPOR IN THE AIR?WATER VAPOR IN THE AIR?

WHAT DID YOU DO TO GET WATER WHAT DID YOU DO TO GET WATER VAPOR TO CONDENSE?VAPOR TO CONDENSE?

WAS HEAT TRANSFER INVOLVED IN WAS HEAT TRANSFER INVOLVED IN THE CONDENSATION PROCESS? THE CONDENSATION PROCESS?

PONDER/INQUIREPONDER/INQUIRE

IS THERE A TEMPERATURE AT WHICH IS THERE A TEMPERATURE AT WHICH CONDENSATION STARTS TO HAPPEN?CONDENSATION STARTS TO HAPPEN?

WILL CONDENSATION TAKE PLACE AT WILL CONDENSATION TAKE PLACE AT ANY TEMPERATURE IF YOU ALLOW ANY TEMPERATURE IF YOU ALLOW ENOUGH TIME FOR ENERGY ENOUGH TIME FOR ENERGY TRANSFER TO OCCUR?TRANSFER TO OCCUR?

DISCUSS THESE 2 QUESTIONS WITH A DISCUSS THESE 2 QUESTIONS WITH A PARTNER.PARTNER.

PROCEDUREPROCEDURE

FOLLOW THE INSTUCTIONSFOLLOW THE INSTUCTIONS 1. RECORD THE TEMPERATURE OF A 1. RECORD THE TEMPERATURE OF A

HALF CUP OF WATER.HALF CUP OF WATER. ADD 1 ICE CUBE. STIR CAREFULLY ADD 1 ICE CUBE. STIR CAREFULLY

WITH A THERMOMETER.WITH A THERMOMETER. MONITER THE TEMPERATURE.MONITER THE TEMPERATURE. IF ICE MELTS ADD ANOTHER ICE IF ICE MELTS ADD ANOTHER ICE

CUBE, ONE AT A TIME UNTIL YOU SEE CUBE, ONE AT A TIME UNTIL YOU SEE FOG FORM ON THE SIDE OF THE CUP.FOG FORM ON THE SIDE OF THE CUP.

PROCEDURE CONT.PROCEDURE CONT.

REMOVE ICE CUBES THE MOMENT YOU REMOVE ICE CUBES THE MOMENT YOU SEE CONDENSATION ON THE CUP.SEE CONDENSATION ON THE CUP.

RECORD THE TEMPERATURE AT WHICH RECORD THE TEMPERATURE AT WHICH CONDENSATION FIRST OCCURRED.CONDENSATION FIRST OCCURRED.

POUR THE WATER INTO AN EMPTY DRY POUR THE WATER INTO AN EMPTY DRY CUP. WATCH TO SEE IF CONDENSATION CUP. WATCH TO SEE IF CONDENSATION FORMS. IF IT DOESN’T RECORD THE TEMP.FORMS. IF IT DOESN’T RECORD THE TEMP.

PROCEDURE CONT.PROCEDURE CONT.

IF FOG DOES OCCUR, CONTINUE TO IF FOG DOES OCCUR, CONTINUE TO POUR WATER BACK AND FORTH POUR WATER BACK AND FORTH UNTIL NO FOG FORMS ON THE CUP.UNTIL NO FOG FORMS ON THE CUP.

RECORD THE HIGHEST RECORD THE HIGHEST TEMPERATURE AT WHICH TEMPERATURE AT WHICH CONDENSATION OCCURRED.CONDENSATION OCCURRED.

SET UP A RECORDING CHART.SET UP A RECORDING CHART.

CONDENSATION CHARTCONDENSATION CHART

TEMPERATURETEMPERATURE CONDENSATION (YES CONDENSATION (YES OR NO)OR NO)

REPORT RESULTSREPORT RESULTS

WHEN FINISHED RECORDING INFORMATION WHEN FINISHED RECORDING INFORMATION ON THE CHART, WRITE YOUR GROUPS ON THE CHART, WRITE YOUR GROUPS HIGHEST TEMPERATURE AT WHICH HIGHEST TEMPERATURE AT WHICH CONDENSATION FORMS.CONDENSATION FORMS.

ONCE ALL TEMPERATURES ARE ONCE ALL TEMPERATURES ARE RECORDED ON THE BOARD, CALCULATE RECORDED ON THE BOARD, CALCULATE THE AVERAGE TEMPERATURE AT WHICH THE AVERAGE TEMPERATURE AT WHICH WATER VAPOR CONDENSES.WATER VAPOR CONDENSES.

RECORD THE TEMPERATURE ON YOUR RECORD THE TEMPERATURE ON YOUR CHART. CHART.

DEW POINTDEW POINT

SOME PEOPLE REFER TO THE CONDENSATION ON THE SIDE OF THE GLASS AS DEW.

WHAT IS DEW?

HOW DOES DEW FORM?

DEFINITIONDEFINITION

DEW POINT - IS THE TEMPERATURE DEW POINT - IS THE TEMPERATURE AT WHICH AIR IS SATURATED.AT WHICH AIR IS SATURATED.

DEW POINT QUESTIONSDEW POINT QUESTIONS

OPEN TO PAGE 35 “OPEN TO PAGE 35 “DEW POINT QUESTIONS”” IN YOUR LAB BOOK.

WORK BY YOURSELF TO ANSWER THE QUESTIONS.

THERMOMETERSTHERMOMETERS

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?

DEMONSTRATIONDEMONSTRATION

I WILL CONDUCT AN EXPERIMENT I WILL CONDUCT AN EXPERIMENT JUST LIKE YOU DID EARLIER.JUST LIKE YOU DID EARLIER.

THIS TIME WE WILL FIGURE OUT THIS TIME WE WILL FIGURE OUT RELATIVE HUMIDITY.RELATIVE HUMIDITY.

CALCULATIONSCALCULATIONS

AFTER FIVE MINUTES OF WAVING THE AFTER FIVE MINUTES OF WAVING THE THERMOMETERS, RECORD THE THERMOMETERS, RECORD THE TEMPERATURES.TEMPERATURES.

TURN TO PAGE 79 IN THE RESOURCE TURN TO PAGE 79 IN THE RESOURCE BOOK “HUMIDITY CALCULATOR”.BOOK “HUMIDITY CALCULATOR”.

CALCULATIONS CONT.CALCULATIONS CONT.

SUBTRACT THE WET-BULB TEMPERATURE SUBTRACT THE WET-BULB TEMPERATURE FROM THE DRY-BULB TEMPERATURE TO FROM THE DRY-BULB TEMPERATURE TO DETERMINE THE DIFFERENCE.DETERMINE THE DIFFERENCE.

FIND THE DRY-BULB TEMPERATURE ON FIND THE DRY-BULB TEMPERATURE ON THE LEFT COLUMN OF THE CHART.THE LEFT COLUMN OF THE CHART.

FIND THE TEMPERATURE DIFFERENCE IN FIND THE TEMPERATURE DIFFERENCE IN THE ROW ACROSS THE TOP OF THE THE ROW ACROSS THE TOP OF THE CHART.CHART.

FIND THE SQUARE WHERE THE TWO FIND THE SQUARE WHERE THE TWO READINGS INTERSECT. THIS IS THE READINGS INTERSECT. THIS IS THE RELATIVE HUMIDITY.RELATIVE HUMIDITY.

READINGREADING

READ PAGE 34 IN RESOURCE BOOK “ READ PAGE 34 IN RESOURCE BOOK “ DRAGON’S BREATH”DRAGON’S BREATH”

ANSWER THE QUESTIONS THAT ANSWER THE QUESTIONS THAT FOLLOW.FOLLOW.