Answer: During hot sunny day, the surface of roof or ground absorbs large amount of heat and remains hot, on sprinkling water on these surfaces, the water absorbs large amount of heat from the surface due to its large latent heat of vaporisation thereby allowing the hot surface to cool.
What is the effect of sprinkling of water on the roof or open ground on a hot sunny day?
When people sprinkle water on roof or open ground, the water evaporates and take energy from ground and leaving a cool surface behind. Hence evaporation causes cooling.
Why do people drink water on the roof after a hot sunny day?
We sprinkle water on the roof or open ground in hot summers. … It evaporates or vaporises by taking the large amount of latent heat from the roof or ground and surrounding air. Hence, the roof or ground becomes cool after losing its heat to water.
Why do people sprinkle water on the ground in front of their homes during the hot summer evenings?
people often sprinkle water on the ground in front of their home during the hot summer evening. … people sprinkle water on the ground in front of their houses because the water on the ground evaporates taking the latent heat from atmosphere and thus produces a cooling effect.
Does spraying your roof with water cool your house?
Also called an evaporative cooling system, a roof misting system lowers surface temperatures by spraying an extremely small amount of water across the roof, allowing the water to cool the roof as it evaporates.
Why do we sprinkle water before sweeping in a dusty room?
Water is sprinkled before sweeping the room as it helps to coagulate the dust particles. Light particles after coagulation become heavier and settle down due to which it becomes easier to remove them easily.
Why do shopkeepers sprinkle water?
The water sprinkle make the dust particle to settle down due to which dust particle doesn’t blow with wind as they are wet with heavy molecules of water whereas in cemented place no process occurs so water sprinkle is not required.
How does evaporation depend on temperature and humidity?
Evaporation increases with a decrease in humidity
If the temperature increases and the wind speed and humidity stay constant, then the rate of evaporation will increase since warmer air can hold more water vapor than colder air.
Why is ice at 273k more effective in cooling than water at the same temperature?
– At 273 K, ice absorbs more heat than water from the substance to overcome the latent heat of fusion and thus providing a more effective cooling effect. Water however does not absorb any extra heat from the substance. Thus, ice is more effective in cooling than water at 273 Kelvin.
Why does ice at 0 C appear colder than water at same temperature?
Answer Expert Verified
When ice placed at zero degree Celsius, latent heat absorbed by the ice is greater than the same heat absorbed by the water at same point of temperature that is zero degree Celsius. This is the reason why ice is colder than the water at zero degree.
Why does the rate of evaporation of an aqueous solution decrease with increase in humidity?
Rate of evaporation of an aqueous solution decreases with increase in humidity. … If humidity is high, then air is already saturated with water vapours, i.e., it has a lot of water vapours. Therefore, it will not take more water vapours easily. Hence, the rate of evaporation decreases.
What do you understand by the term latent heat of fusion?
The amount of heat required to convert one unit amount of substance from the solid phase to the liquid phase — leaving the temperature of the system unaltered — is known as the latent heat of fusion. …
Which roof is best for hot climate?
The Best Roof Material for a Hot Climate
- Best of all, green roofs are considered energy-efficient and naturally reduce the heat island effect. …
- However, green roofs require good planning, expertise, and vision.
How do I keep my roof from getting hot?
How to Beat the Summer Heat by Keeping the Roof Cool
- Grow a roof garden. One of the best ways to keep the roof cool is by growing your own rooftop garden with green grass and potted plants. …
- Paint the terrace white. …
- Add shade. …
- Go for heat-resistant flooring. …
- Install solar panels.
How do I keep my roof cool in the summer?
ATTIC VENTILATION AND INSULATION
- GET A COOL, LIGHTER-COLORED ROOF.
- INCREASE SHADE (TREES, ETC.)
- INSTALL SOLAR PANELS ON YOUR ROOF.