Thermos Flask NZ provides ultimate insulation
A thermos flask, also known as a vacuum flask provides the ultimate insulation to keep your beverages hot or cold inside the flask. Some jugs or thermos use insulating materials made of plastic foam. The trapped air bubbles in this plastic foam allow them to act as insulators. However, in the case of a vacuum flask, the space inside the flask is completely evacuated of air. This helps slow down the spread of heat or cold inside the thermos, depending on whether you are carrying a hot or cold beverage.
How does a Thermos Flask work?
Heat transfer works by conduction and convection. This means that the transfer of heat inside any space works through conduction, which is the process of collision between molecules. However, in the case of a vacuum flask, the inside of the flask is just empty space that contains no or very few molecules. Hence, neither conduction nor convection takes place inside the flask to transfer heat.
Vacuum Insulation in a Thermos
The thermos flask is a common example of vacuum insulation at work. The flask has an inner and outer wall that is separated by a thin layer of vacuum or empty space. The inside of the outer wall is made of reflective material to bounce back any infrared light which may be present inside the flask. The flask also comes with a stopper to reduce heat loss.
Basically, the double-walled containers in the insulted or vacuum flasks use the same concept which is used in double-glazed windows. This helps regulate the temperature of the drink inside.
Bigger Flasks give better performance
When it comes to thermal performance, research shows that bigger flasks give better performance. Smaller flasks or thermos take up less space and are ideal when you have to carry liquid for one person only. It is also lighter in weight and easy to carry and takes up less space. However, larger or bigger flasks can keep the contents warmer for a longer period of time. This is backed by physics.
A smaller container has more exposed surface area per litre of liquid, so the liquid inside reverts back to the ambient temperature much faster. Similarly, a larger flask will have a lesser exposed surface area per litre of liquid, so the contents stay hot or cold longer.
Use of Vacuum Insulation
The use of vacuum insulation if not just restricted to flasks and thermos. The same construction is also applied to some top model freezer units as well as refrigerators that are used for cold shipping. In other cases, these vacuum installation panels may also be employed in the construction of buildings as well.
If you are looking to buy a thermos flask NZ, a good idea would be to check the range of thermos flasks available online at Twinkles.