Question

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

1️⃣ Iron
2️⃣ Glass
3️⃣ Steel
4️⃣ Plastic​

Answer 1

Answer:

3 steel because

Made from stainless steel, it has a silicone seal ring that seals tight to. They have double-walled construction with a vacuum seal between the outer and inner wall that insulates your liquid. Or, put them together first and connect them to the flask as one unit

Answer 2

Answer:

Steel

Explanation:

Thermo flasks have 2 chambers-

a. Inner chamber - The inner chamber is for the storage of water

b. Outer chamber - The outer chamber can be of plastic or a metal or plastic.

The two chambers are separated by 2 layers of glass or stainless steel in case of the unbreakable flask, which has a reflective metal lining.

To make them spill-proof, there is a tight, screw-down stopper at the top.

These layers prevent the loss of heat through conduction, convection, and radiation.