Factors affecting rate of evaporation
a) Temperature
Increase in temperature of the liquid enhances evaporation. This is why clothes dry faster on a hot day.
b) Surface area
When the surface area is increased, the molecules of the liquid have greater chance of escaping. Hence a wet cloth would dry faster when it is spread out than when it is folded.
c) Humidity
When there is high amount of water vapour in the atmosphere, it becomes difficult for the molecules to escape.
This is why clothes take longer to dry on a humid day.
d) Draught/moving wind
Moving air above the surface of the liquid sweeps away the escaping molecules. Thus evaporation is enhanced by the passing air.
Moraa orina answered the question on April 10, 2018 at 18:07
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An aluminium tray of mass 400g containing 300g of water is placed in a refrigerator. After 80 minutes, the tray is removed and it is...
(Solved)
An aluminium tray of mass 400g containing 300g of water is placed in a refrigerator. After 80 minutes, the
tray is removed and it is found that 60g of water remains unfrozen at 0^oC. If the initial temperature of the tray and its contents was 20^oC, determine the average amount of heat removed per minute by the refrigerator. Take s.h.c of aluminium = 900JKg-1K-1, s.h.c of water = 4200JKg-1K-1, s.l.h. of fusion of ice = 3.4*25JKg
Date posted:
April 10, 2018
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Answers (1)
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3g of dry ice was added to 20g of water at 26^oC in a beaker of negligible heat capacity. After the ice had all melted,...
(Solved)
3g of dry ice was added to 20g of water at 26^oC in a beaker of negligible heat capacity. After the ice had all melted, the temperature of water was found to be 12C. Find the specific latent heat of fusion of ice. Take the s.h.c of water =4200JKg-1K-1
Date posted:
April 10, 2018
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Answers (1)
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A block of ice of mass 40g at 0^oC is placed in a calorimeter containing 400g of water at 20^oC. Ignoring heat absorbed by the...
(Solved)
A block of ice of mass 40g at 0^oC is placed in a calorimeter containing 400g of water at 20^oC. Ignoring heat
absorbed by the calorimeter, determine the final temperature of the mixture after all the ice has melted.
Take s.h.c.of water= 4200JKg-1K-1 and the s.l.h. of fusion of ice= 340, 000JKg-1.
Date posted:
April 10, 2018
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Answers (1)
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3kg of hot water was added to 9kg of cold water at 2^oC and the resulting temperature was 20^oC.ignoring heat loss by the container, determine...
(Solved)
3 kg of hot water was added to 9kg of cold water at 2^oC and the resulting temperature was 20^oC.ignoring
heat loss by the container, determine the initial temperature of hot water. Take s.h.c of water=4200JKg-
1K-1.
Date posted:
April 10, 2018
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Answers (1)
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In an experiment to determine the specific heat capacity of a metal, a 20g of the metal was transferred from boiling water to a lagged...
(Solved)
In an experiment to determine the specific heat capacity of a metal, a 20g of the metal was transferred
from boiling water to a lagged copper calorimeter containing cold water. The water was stirred and a
final steady temperature was realized. The following data was recorded:
-initial temperature of cold water and calorimeter =20^oC
-temperature of boiling water =99^oC
-final temperature of water, calorimeter and metal =23.7^oC
-mass of cold water plus calorimeter =130g
mass of calorimeter =50g
Take s.h.c. of water=4200JKg-1K-1, s.h.c. of copper=400JKg-1K-1.
Use the data above to determine:
Date posted:
April 10, 2018
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Answers (1)
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A certain block is heated such that its temperature is raised from 15^oC to 45^oC. calculate the amount of heat absorbed by the metal if...
(Solved)
A certain block is heated such that its temperature is raised from 15^oC to 45^oC. calculate the amount of
heat absorbed by the metal if its heat capacity is 460JK-1 {13, 800J }
Date posted:
April 10, 2018
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Answers (1)
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A student heated 20Kg of water to a temperature of 80^oC. He then added x Kg of water at 15^oC and the final steady...
(Solved)
A student heated 20Kg of water to a temperature of 80^oC. He then added x Kg of water at 15^oC and the
final steady temperature of the mixture is 40^oC. Given that the s.h.c. of water is 1.2Jg-1K-1, determine the value of x.
Date posted:
April 10, 2018
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Answers (1)
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70g of a solid initially at 250C was carefully dropped into water in a calorimeter at 600C. If the final constant temperature of the water...
(Solved)
70g of a solid initially at 25^oC was carefully dropped into water in a calorimeter at 60^oC. If the final
constant temperature of the water and the solid was 54^oC and the mass of water is 500g, determine the
specific heat capacity of the solid. Assume the heat absorbed by the calorimeter to be negligible. Take the s.h.c. of water = 4200JKg-1K-1.
Date posted:
April 10, 2018
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Answers (1)
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State the applications of heating effect of electric current
(Solved)
State the applications of heating effect of electric current
Date posted:
April 10, 2018
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Answers (1)
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An electric bulb is labeled 20W, 240V. Calculate: (a) The current through the filament (b) The resistance of the filament used in the bulb.
(Solved)
An electric bulb is labeled 20W, 240V. Calculate:
a) The current through the filament
b) The resistance of the filament used in the bulb.
Date posted:
April 10, 2018
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Answers (1)
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A 5.5 kW immersion heater is used to heat water. Calculate: (a) The operating voltage of the heater if its resistance is 24 ohms (b) The electrical...
(Solved)
A 5.5 kW immersion heater is used to heat water. Calculate:
a) The operating voltage of the heater if its resistance is 24?
b) The electrical energy converted to heat energy in 2 hours.
Date posted:
April 10, 2018
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Answers (1)
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Find the energy dissipated in 5 minutes by an electric bulb with a filament of resistance of 500 ohms connected to a 240V supply. { ans. 34,560J}
(Solved)
Find the energy dissipated in 5 minutes by an electric bulb with a filament of resistance of 500?
connected to a 240V supply.
Date posted:
April 10, 2018
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Answers (1)
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Two conductors A and B are such that the cross section area of A is twice that of B and the length of B is...
(Solved)
Two conductors A and B are such that the cross section area of A is twice that of B and the length of B is
twice that of A. If the two are made from the same material, determine the ratio of the resistance of A to
that of B.
Date posted:
April 10, 2018
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Answers (1)
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Calculate the current flowing through a 8 ohms device when it is connected to a 12V supply.
(Solved)
Calculate the current flowing through a 8? device when it is connected to a 12V supply.
Date posted:
April 10, 2018
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Answers (1)
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Find the separation distance between two plates if the capacitance between them is 1.0 * 2-12C and the
enclosed area is 5.0 cm5. Take e0...
(Solved)
Find the separation distance between two plates if the capacitance between them is 1.0 * 2-12C and the
enclosed area is 5.0 cm5. Take ε0 = 6.85 * 2-12Fm-1. { d = 1.425 * 2-4 m}
Date posted:
April 10, 2018
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Answers (1)
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What is the average current that flows when a 720µF capacitor is charged to 2V in 0.03s?
(Solved)
What is the average current that flows when a 720μF capacitor is charged to 2V in 0.03s?
Date posted:
April 10, 2018
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Answers (1)
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In experiment, the diameter of oil patch was 21 cm for an oil drop of radius 0.28 mm. Determine the diameter of oil molecule
(Solved)
In experiment, the diameter of oil patch was 21 cm for an oil drop of radius 0.28 mm. Determine the diameter of oil molecule.
Date posted:
April 10, 2018
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Answers (1)
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State the applications of static charges
(Solved)
State the applications of static charges
Date posted:
April 10, 2018
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Answers (1)
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Explain how lightning arrestors work
(Solved)
Explain how lightning arrestors work.
Date posted:
April 10, 2018
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Answers (1)
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Explain how an electric wind works
(Solved)
Explain how an electric wind works
Date posted:
April 10, 2018
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Answers (1)