Do You Know
Questions & Answers on General Knowledge.
Why do washed clothes dry faster in open air than in a closed room?
What thrills me about your question is that while we've all noticed this effect, we're never taught why it happens. Let me ask your question in another way: we know that opening a window makes the clothes dry faster, but how do the clothes know that the window is open? Who tells them? The explanation is both simple and interesting: the rate at which water molecules >em>leave>/em> the cloths doesn't depend on whether the window is open or closed, but the rate at which water molecules >em>return>/em> to the cloths certainly does. That return rate depends on the air's moisture content and can range from zero in dry air to extremely fast in damp air. Air's moisture content is usually characterized by its relative humidity, with 100% relative humidity meaning that air's water molecules land on surfaces exactly as fast as water molecules in liquid water leave its surface. When you expose a glass of water to air at 100% relative humidity, the glass will neither lose nor gain water molecules because the rates at which water molecules leave the water and land on the water are equal. Below 100% relative humidity, the glass will gradually empty due to evaporation because leaving will outpace landing. Above 100% relative humidity, the glass will gradually fill due to condensation because landing will outpace leaving. The same story holds true for wet clothes. The higher the air's relative humidity, the harder it becomes for water to evaporate from the cloths. Landing is just too frequent in the humid air. At 100% relative humidity the clothes won't dry at all, and above 100% relative humidity they'll actually become damper with time. When you dry clothes in a room with the window open and the relative humidity of the outdoor air is less than 100%, water molecules will leave the clothes more often than they'll return, so the clothes will dry. But when the window is closed, the leaving water molecules will remain trapped in the room and will gradually increase the room air's relative humidity. The drying process will slow down as the water-molecule return rate increases. When the room air's relative humidity reaches 100%, drying will cease altogether.
What is a test-tube baby?
What is a light year?
How can I make 1000 nanometer light waves visible to the human eye?
Why is the bald eagle the official national symbol of the United States?
Why do we call money saved for a rainy day a “nest egg”?
Why do north and south poles on magnets change back and forth?
Do insects lay their eggs in a nest?
How do you get static out of hair?
How do color copiers work?
Why do men wear neckties?
How do volcanoes erupt?
Why are vain people said to be “looking for the limelight”?
Do crocodilians make good parents?
What is drag force?
What is the corona?
Why is it so difficult for women to join prestigious British golf clubs?
What is African theatre about?
Did other countries benefit from the Industrial Revolution?
How does the spitting cobra get its name?
With Newton's first law, the word "tends" seems a bit ambivalent. Does this word suggest there are exceptions to the rule?
Was penicillin discovered by accident?
What was the origin of a New York “ticker tape parade”?
What causes a rainbow?
Were ancient Greeks good at art?
How does altitude affect the presence of molecules?
Top Hotels of the World
101 Ideas to Save Ten Dollar a Week
Resting Metabolic Rate Calculator