This was the greatest invention to people who are often away from a heat source or a cooling source. Often, we find ourselves caught up with things that take up most of the time.
Having a thermos flask to have a hot meal or beverage or an icy cold drink comes in handy in these situations.Vacuum flasks are used by many people on a daily basis to help retain the food or drink just made at the same temperature for hours. We have created a guide of all the best models on the market here https://productspy.co.uk/best-thermos-flask-reviews/
This brings us to the next question, how does a thermos flask work.
Let’s Find Out
To understand the inner mechanisms of a thermos flask, first you need to know the number of ways heat flows.
Conduction Convection Radiation How a Thermos Flask Work
A thermos flask consists of the following:
To retain the drinks at the same temperature, a thermos flask minimizes heat transfer through conduction and radiation. Convection keeps the temperature inside even. The vacuum insulation is very useful at eliminating heat transfer by conduction and convection. A vacuum contains no atoms whatsoever, and without atoms, not heat transfer will happen. Then there is a glass envelope that holds the vacuum. Around the glass is a vacuum space.
The glass, obviously, is a very delicate object so there is a plastic or stainless steel casing to protect it. This encased glass is made of a reflective material (like a mirror) which reduces heat transfer by radiation. There is a stopper that encloses the contents of the flask that is made tight to prevent air from coming in or going out of the thermos flask.
In simpler terms, a thermos flask doesn’t any of the three ways that heat can travel in. The glass is made like a mirror to prevent radiation and the vacuum created by the double walls prevents convection. The glass is made so thin to prevent heat coming in or getting out through the flask by conduction. Outside is an extra casing that provides additional insulation. And the stopper seals in the heat and prevents heat getting in by convection.