WONDER #971: How Does a Thermos Work?

Question 1 of 3

The scientific secret of a thermos is a what?

1. vacuum
2. seal
3. lid
4. cap

Question 2 of 3

A vacuum is the absence of what?

1. water
2. heat
3. suction
4. air

Question 3 of 3

Thermoses keep hot things hot and cold things cold by reducing what?

1. vacuum
2. heat transfer
3. gravity
4. humidity

Check your answers online at https://www.wonderopolis.org/wonder/how-does-a-thermos-work.