What are the main difference between boiling and evaporation
Answers
Answer:
evaporation is slower, occurs only from the surface of the liquid, does not produce bubbles, and leads to cooling. Boiling is faster, can occur throughout the liquid, produces lots of bubbles, and does not result in cooling.
Explanation:
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Answer:
Temperature required: A liquid will evaporate at any temperature above freezing. In the previous example, the water was at room temperature, and it slowly evaporated. If the water was warmer, it would have evaporated faster. In contrast, boiling occurs only when the liquid reaches a certain temperature, which we call the boiling point. The boiling point of water at sea level is 100°C (212°F).
Bubbles: Evaporation does not involve the formation of bubbles. When liquid evaporates, individual molecules leave the liquid and become part of the air. In Figure 2, the dots represent molecules. The ones that leave the liquid and become part of the gas (air) are evaporating. The ones that go from gas to liquid are condensing. When the water in your glass was evaporating, molecules must have been moving from the water to the air more often than molecules were moving from the air to the water. So there was a net transfer of water molecules from the liquid in the glass to the air. As you can see from Figure 2, this process does not involve any bubbles. In contrast, when you boil water, the liquid is changing to a gas so rapidly that bubbles of water vapor form. Here’s a think-pair-share question for students: When you boil water and see bubbles, is there anything in the bubbles? If so, what are the bubbles made of? Some students might think those are air bubbles. But now you understand that they’re not air bubbles; they’re bubbles of water vapor—water that has changed from a liquid to a gas. Is there an easy way to demonstrate that the bubbles contain water molecules? Yes! Bring a pot of water to a rolling boil. Put a lid on it for about 20 seconds, and then remove the lid and look at the inside of it. It’s covered with drops of water from those bubbles that condensed on the cooler lid (Figure 3).
Explanation:
Speed: Evaporation is a slower process and boiling is faster. Try this: In the weeks leading up to a lesson on the water cycle (including evaporation and condensation), set a tall glass of water on a shelf, and have students measure the height of the water every few days and keep a table showing the changing level (Figure 1). If students don’t already know what’s going to happen, don’t tell them; let them discover it. They can also graph the height of the water over time. Then when you’re ready to talk about evaporation, ask, “What happened to the water that was in the glass? Where did it go?” (This investigation could also be done with students reading the amount of water remaining in a graduated cylinder, but you might prefer to have students practice making measurements with the ruler.) In contrast, you can boil water on a hot plate and watch the water level lower in a matter of minutes, rather than the days and weeks it takes for water to evaporate.