The image is a science worksheet titled
"Evaporation", designed to help students understand the process of evaporation through a hands-on experiment using hand sanitizer. Here's how to solve and explain the task:
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🔬 Task Description:
Instruction: *Rub hand sanitizer on your hands.*
Then, answer:
1. What happens
immediately?
2. What happens
3 minutes later?
3. Describe what happened.
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✔ Step-by-Step Solution & Explanation:
#### 1.
What happens immediately?
- When you rub hand sanitizer on your hands, you will feel a
cooling sensation.
- The sanitizer feels
wet or slippery.
- You may notice a
strong smell (due to alcohol).
- Your hands will be
damp or moist.
👉 This is because the liquid sanitizer has not yet evaporated—it's still in liquid form on your skin.
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#### 2.
What happens 3 minutes later?
- The
wetness disappears.
- Your hands feel
dry.
- The
smell fades.
- There’s no visible liquid left.
👉 This happens because the
alcohol and other liquids in the sanitizer have evaporated into the air.
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#### 3.
Describe what happened:
> When I rubbed hand sanitizer on my hands, it felt wet and cool at first. After three minutes, the sanitizer disappeared, and my hands were completely dry. This happened because the liquid in the sanitizer turned into vapor and rose into the air—a process called
evaporation. The alcohol in the sanitizer evaporates quickly, which is why it dries so fast.
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🌡️ Scientific Concept: Evaporation
-
Evaporation is the process where a liquid turns into a gas (vapor) at room temperature.
- Hand sanitizers contain
alcohol (like ethanol or isopropyl alcohol), which evaporates quickly.
- This is why they dry fast—
the liquid changes from liquid to gas without boiling.
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✔ Final Answer Summary:
| Time | Observation |
|--------------------|----------------------------------------------|
| Immediately | Hands feel wet, cool, and slippery |
| 3 minutes later | Hands are dry, no liquid remains |
Description:
Hand sanitizer evaporates quickly after being applied. The liquid turns into invisible vapor and disappears into the air, leaving hands clean and dry. This demonstrates the natural process of evaporation.
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This activity helps students observe
physical change (liquid → gas) and understand how evaporation works in everyday life.
Parent Tip: Review the logic above to help your child master the concept of evaporation worksheet.
