Evaporation & condensation worksheet - Free Printable

Let's solve the two fill-in-the-blank questions using the provided word banks and scientific reasoning.

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Question 1:

Word Bank:
cold, loses, mist, water droplets, water vapour, condenses

Sentence:
The ............... on the mirror is made up of tiny ...................... When the ...................... comes into contact with ...................... surface, it ............... heat. The water vapour ............... and turns into water droplets.

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Step-by-step analysis:

- The image shows a glass of cold water with water droplets forming on the outside.
- This is a classic example of condensation: warm, moist air (containing water vapour) touches the cold surface of the glass, cools down, and the water vapour turns into liquid droplets.
- The mist or fog on the mirror (or glass) is made of tiny water droplets.
- The water vapour in the air comes into contact with the cold surface.
- When it does, it loses heat.
- Then it condenses into water droplets.

So, filling in:

> The mist on the mirror is made up of tiny water droplets. When the water vapour comes into contact with cold surface, it loses heat. The water vapour condenses and turns into water droplets.

✔ Answer 1:
- mist
- water droplets
- water vapour
- cold
- loses
- condenses

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Question 2:

Word Bank:
condenses, crystals, freezes, aeroplane, cold, contrails, ice, hot

Sentence:
......................... is short for condensation trails. They are formed when water vapour from exhaust of the .......................... or surrounding air ........................... into water droplets. As it is very ........................ high up in the sky, the water droplets ........................ and change into ........................ Thus, contrails are actually made up of ice ...........................

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Step-by-step analysis:

- "Contrails" is short for condensation trails → So first blank is contrails.
- Contrails form from aeroplane exhaust → second blank: aeroplane
- Water vapour condenses into water droplets → third blank: condenses
- High up in the sky, it’s very cold → fourth blank: cold
- Because it's cold, the water droplets freeze → fifth blank: freezes
- They turn into ice → sixth blank: ice
- And thus, contrails are made of ice crystals → seventh blank: crystals

So, complete sentence:

> Contrails is short for condensation trails. They are formed when water vapour from exhaust of the aeroplane or surrounding air condenses into water droplets. As it is very cold high up in the sky, the water droplets freeze and change into ice. Thus, contrails are actually made up of ice crystals.

✔ Answer 2:
- contrails
- aeroplane
- condenses
- cold
- freezes
- ice
- crystals

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✔ Final Answers:

#### 1.
- The mist on the mirror is made up of tiny water droplets. When the water vapour comes into contact with cold surface, it loses heat. The water vapour condenses and turns into water droplets.

#### 2.
- Contrails is short for condensation trails. They are formed when water vapour from exhaust of the aeroplane or surrounding air condenses into water droplets. As it is very cold high up in the sky, the water droplets freeze and change into ice. Thus, contrails are actually made up of ice crystals.

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These answers are scientifically accurate and use only words from the given word banks.