Termo

The video explains how a thermos maintains the temperature of its contents by using thermal insulation. It describes the structure of a thermos, which includes an outer wall and an inner glass envelope, and how the vacuum between these layers prevents heat transfer. The video also discusses the role of the lid in maintaining temperature and the limitations of a thermos, as heat can eventually flow through the lid and glass. Overall, the thermos reduces heat flow, keeping liquids hot or cold for extended periods.

What is the primary function of the vacuum in a thermos?

• To add weight to the thermos

• To enhance the taste of the contents

• To prevent heat flow

• To allow air circulation

Which material is commonly used for the lid of a thermos to maintain temperature?

• Metal

• Wood

• Cork or plastic

• Glass

How does a thermos keep hot liquids warm?

• By allowing heat to escape

• By reflecting heat back into the liquid

• By preventing heat from entering

• By absorbing heat from the surroundings

What happens to the heat transfer in a thermos over time?

• It remains constant

• It stops completely

• It decreases

• It increases

What is the main role of a thermos in terms of heat energy?

• To increase heat flow

• To reduce heat flow

• To eliminate heat flow

• To generate heat