How does liquid remain hot or cold for a long time in a thermos flask because there is no loss or gain of heat? - Quora

Can an unbreakable glass thermos flask be made? How? - Quora

Can you put warm liquid in a metal thermos? - Quora

Can a thermos keep things cold? - Quora

How long can liquid nitrogen maintain its liquid temperature inside a (portable) liquid nitrogen container (~75 liters)? - Quora

When heat is transferred to a solid, what happens? - Quora

Why can't we keep water hot for years in a well-made vacuum flask? - Quora

What is the best water bottle insulation technology availible? - Quora

How long will stainless steel flasks retain heat? - Quora

Which is the best budget thermos flask I can buy in India? - Quora