Question

*What are the sealed tubes in a thermos flask made of?*

1️⃣ Iron
2️⃣ Glass
3️⃣ Steel
4️⃣ Plastic​

Answer 1

Answer:

3️⃣ Steel

Explanation:

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Answer 2

The sealed tubes in a thermos flask are made of steel. (Option 3)

• Thermos flasks are water bottles that are insulated and are made of stainless steel.
• They have two layers made of steel and an insulating layer of vacuum in between.
• The vacuum ensures that the convection process does not take place.
• As a result, the cold or heat inside the flask cannot escape due to the lack of a medium.
• This arrangement makes the flask a thermos flask with the insulating property of retaining the temperature for a long duration.