Question

*What causes thermos flask not to conduct or convey heat?*

1️⃣ Vacuum
2️⃣ Glass tube
3️⃣ Jar
4️⃣ Rubber​

Answer 1

Explanation:

• A thermos flask is used to store the liquids, it stores hot liquids as hot and cool liquids as cool.
• Thermos flask is a vacuum vessel i.e it is a hollow flask.
• Due to the vacuum between the walls of the vessel heat cannot conduct/convey/escape from the flask.
• The insulated rubber cap seals the flask and leaves no way for the heat transfer.
• As the outer walls are silver, they also prevent the heat transfer.