Liquids and Their Properties

• Define a liquid and list its main properties.
• Explain why liquids take the shape of their container.
• Identify common liquids used at home.
• Connect liquids to everyday Indian activities like cooking and drinking.

Level 1 - Meaning of a liquid

A liquid is a material that does not have a fixed shape but does have a fixed volume. Water, milk, and cooking oil are common liquids that flow and take the shape of whatever container holds them.

Level 2 - Why liquids flow

Inside a liquid, the tiny particles can move and slide past each other, though they still stay close together. This is why a liquid can be poured and will spread to fit the shape of a glass, bottle, or bowl.

Level 3 - Fixed volume, changing shape

If a cup of milk is poured into a tall glass or a wide bowl, its shape changes, but the amount of milk stays the same. This shows that a liquid keeps a fixed volume even though it has no fixed shape.

Level 4 - Indian context

Nimbu paani, milk, and mustard oil are liquids used every day in Indian kitchens. Tankers carry large volumes of milk or water and the liquid simply takes the shape of the tanker or container it is poured into.

NCERT anchor: Looking Around 4, Ch 18 — Too Much Water, Too Little Water (water as a liquid resource)

Pouring water into different shapes

Step 1 - Pour a glass of water into a round bowl.
Step 2 - Observe the water spreads to the round shape of the bowl.
Step 3 - Pour the same water into a tall bottle.
Step 4 - Observe the water now takes the tall, narrow shape of the bottle.
Answer: The shape of the water changed, but the amount (volume) of water stayed the same.

Comparing honey and water

Step 1 - Tilt a spoon of water over a plate.
Step 2 - Notice the water flows quickly.
Step 3 - Tilt a spoon of honey over a plate.
Step 4 - Notice the honey flows much more slowly.
Answer: Both are liquids, but honey is thicker, so it flows more slowly than water.

• What are the two main properties of a liquid?
• Name three liquids used in your home.
• Why does water take the shape of the bottle it is poured into?
• Does the amount of water change when poured from a bottle into a glass?
• Stretch: Explain why honey flows more slowly than water even though both are liquids.

Revision tip: A liquid has no fixed shape but does have a fixed volume; it takes the shape of its container.

Open the Practice tab for graded questions on Liquids.