Second Grade · Science · week 1

Solid, liquid, gas sort

Sort everyday objects into solid, liquid, or gas by testing whether each one holds its own shape, flows, or fills up space.

Everything around you is made of matter, and matter comes in three main forms: solid, liquid, and gas. A solid holds its own shape. A rock stays a rock whether it sits on a table or in your pocket. A liquid does not hold its own shape; it flows and takes the shape of whatever holds it, like juice filling a cup.

A gas spreads out to fill all the space it can, and you often cannot even see it. The air around you right now is a gas. It has no shape of its own at all, yet it is still real matter, because it takes up space and can push against a fan or a balloon.

📋 For the teacher
Teach it (10–15 min):
  • Gather a few real objects and a cup of water, and test each one by asking together: does it hold its own shape?
  • Pour the same water into two different containers so your child sees the liquid change shape while staying the same amount.
  • Squeeze an empty plastic bottle, or blow up a balloon, so your child can feel that air is real matter even though it is invisible.
  • Resist giving the answer first; let your child test and look before they decide solid, liquid, or gas.
Talk about it:
  • What is one solid, one liquid, and one gas you can find right now?
  • How can you tell a liquid from a solid without tasting it?
  • Why is air still considered matter if you cannot see it?

Mastery looks like: They can sort common objects into solid, liquid, or gas and explain the reason using whether it holds its shape, flows, or spreads to fill space.

Common stumbles: Assuming gas is not real matter because it is invisible; confusing a squishy solid, like a sponge, with a liquid.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Science for this learner.
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