Science Secrets · Drawing 37 of 40
A Bottle That Slows Heat Down
Everyday Inventions
An insulated bottle slows heat transfer. It can keep a drink cool or warm for longer. It does not heat or cool the drink.
Did you know?
Some designs have a nearly empty space between two walls.
Look together
Why does closing the lid help the bottle?
An idea to try
With an adult, compare two closed containers of cool water, including an insulated one. Observe the differences later without using hot water.
For the adult reading along
A little more to discover
A vacuum between walls reduces conduction and convection; other features limit radiation. Insulation is never perfect. The pictured bottles do not represent a brand.
Sources and illustration notes (1)
Simplified scene and shapes. Models, imagined comparisons and enlargements do not preserve all real measurements.
These links lead to other websites. Explore them with an adult. References identify the institution and the related lesson; some linked pages are in French.
- Thermos: How Vacuum Insulation WorksAn insulated bottle slows heat transfer in either direction; it can keep warm drinks warm and cool drinks cool without active heating or refrigeration.
Source review: 2026-10-12. Illustrations are simplified for colouring.
