Many people carry a vacuum bottle with them not only for the hiking but when they go out for a short time or at work in. 

Thermos bottles are very convenient because they allow you to carry warm drinks while they are still warm, but did you know that this is thanks to the ‘vacuum’?

This section provides an easy-to-understand explanation for the mechanism of vacuum bottle.

To begin with, why do warm drinks get cold?

Both hot miso soup and ramen noodles will cool down over time. This is because heat escapes.

When warm and cold items are attached to each other, the heat from the warm item is transferred to the cold item.

As a result, warm and cold items turn out to be of the same temperature.

The heat originally carried by the warm item is transferred to the cold item, resulting in a decrease in the temperature of the warm item.

So, if warm and cold items are not attached to each other, can heat be transferred?

As it turns out, this is not true. Heat can be transferred even without such attachment.

This is because heat is transferred through the air between warm and cold items by electromagnetic waves (light) called ‘infrared radiation’.

More details for types of light.

We keep warm in front of the stove without being directly attached to it because the stove emits infrared radiation.

Why does the ‘vacuum’ hidden in a thermos bottle keeps the heat in?

Thermos bottles have a double-layer construction, with a vacuum between the inner and outer walls. The vacuum here makes it difficult for heat to be transferred.

In the presence of air, heat escapes as infrared radiation. This is because there are many molecules in the air, which transfer heat as energy.

The molecules transfer heat to each other as if they were waving hand in hand.

On the other hand, in a vacuum, there are fewer molecules present, which makes it more difficult for them to join hands and thus heat is less likely to be transferred.

Vacuum tumblers that utilize this thermos technology to drink beer and other cold beverages are also often seen in these days.

Vacuum is used to make our lives more comfortable, for example in vacuum bottles.

Our sputtering equipment, which utilizes such a vacuum, can produce films on a wide range of materials and is used in research and other fields.

For more information on our sputtering equipment, Click here.