Why Do We Build Things to Stay Warm?
People have always wanted to stay warm. Long, long ago, people built shelters — that means places to live inside.
They tried different things to keep warm. Let's see what people learned!
Here is our big question: How can we build something that changes how warm things get?
Big Ideas About Warming and Structures
A structure — that means something we build — can change how warm or cool something stays. Let's learn three big ideas!
Structures Can Warm Things Up
Structures Can Keep Things Cool
We Can Test Our Structures
Different Materials Work Differently
See How Structures Change Warming
Let's look at a picture. It shows two cups of warm water. One cup has a cover. One cup does not.
See the wavy lines above Cup A? Those show heat going away. Cup B has a cover. The cover is a structure. It keeps the warm water warm!
How Does It Work?
What Happens When We Add a Structure?
When something is warm, the heat — that means the warmth — tries to move away. Heat moves from warm things to cooler things.
A structure can slow down the heat. It can block the heat from moving away so fast.
Think about it like this. On a cold day, your warm body tries to share its heat with the cold air. A coat blocks the heat from leaving your body so fast.
The Sun Can Warm Things Too!
The sun sends warmth to us. A structure like a shade or an umbrella can block the sun. That keeps things cooler.
Different Materials, Different Warming
What you build with matters! Some materials — that means the stuff you use — keep things warmer. Others do not.
The wool sock is thick and fluffy. It slows the heat from getting to the ice. The paper towel helped a little. But the ice with nothing melted really fast!
Let's Do a Test Together!
Let's test a structure together! Our question is: Can we keep a cup of warm water warmer by wrapping it?
What Works and What Doesn't?
Not all structures change warming the same way. Some are better than others. Let's compare!
| Structure | Keeps Things Warm? | Keeps Things Cool? |
|---|---|---|
| Thick blanket | Yes! Very good | No |
| Shade cover | No | Yes! Blocks the sun |
| Tin foil wrap | A little | A little |
| Cardboard box | Yes, some | Yes, some |
Where Do We See This in Real Life?
Structures that change warming are all around us! Let's look at some.
| What You Know Now | What You'll Learn Later |
|---|---|
| A coat keeps you warm. | Some materials trap air, which slows heat. |
| A shade keeps you cool. | Blocking light blocks a kind of energy. |
| We can test structures. | Scientists use tools like thermometers to measure heat. |
You see structures that change warming every day. Your house has walls and a roof. They keep you warm in winter. They keep you cool in summer. Your lunch box keeps your food just right!
Practice Time!
Let's think about a new story! Mia has a pet bunny. On a cold day, she wants to keep the bunny's water from getting too cold. She tries different things.
What Did We Learn?
We learned that a structure is something we build. Structures can change how warm or cool things get. We can test our structures by trying them and observing what happens. We can describe what we see by telling others if something got warmer or cooler.
Different materials change warming in different ways. Thick, fluffy materials slow down heat from moving. Shade structures block the sun to keep things cool. When we build and test, we are being scientists!