Yes, the steam can be dry!

If someone tells you “steam” you probably think “humidity”. But the steam can be dry, and this paradox explains the technological prowess of the Dry Steam Cleaner Vapodil.

Let’s give you some explanations.

When you heat water up and reach the boiling temperature (100 °C/212 °F at normal pressure) water turns from a liquid state to a gaseous state, resulting in water vapor. It only requires for this steam to cool down slightly for some of the water molecules to condensate. They form droplets which remain dispersed in the steam: this is the humid steam. To clearly understand, let’s use the example of a kettle. Because of the heat transmitted by the heated element, the water temperature rises up: the water absorbs the heat progressively, the H2O molecules get agitated, and the water starts to boil.

Once a sufficient quantity of energy has been absorbed, some of the molecules vaporizes. The steam escaping from the spout of the kettle is the sign of a heat loss, the dry water steam loses some of its energy when it gets in contact with the ambient air, colder. It then becomes humid steam, because it contains a mixture of water in a liquid state (the small droplets) and in a gaseous state (the vapour).

Now imagine that we keep on heating this steam way over its ebullition temperature. When exceeding 110 °C, even 120 °C, its thermal energy raises up. This superheated steam is the dry steam, it doesn’t contain any liquid molecule, only water molecules in a gaseous state.

 

This is the performance the Dry Steam Cleaner Vapodil reaches: heating up the steam constantly to avoid its immediate condensation when exposed to air or a cold surface. A high technology that provides a very hot a dry steam, which is completely safe for the user. The jet contains a pressurised mixture of approximately 93% of dry air and 7% of water steam, it uses a very small amount of water.

There are no water droplets in the jet, only vapour. The droplets can sometimes appear by condensation of the steam on a colder surface (a glass surface, for instance).