How can the glass can't afford to fog!| Play

Presumably everyone has observed the phenomenon of glass foggy

For example, on the window or the mirror when bathing

If there is a temperature difference and a water vapor, it may cause the glass surface to fog

If you want to prevent fog, you must first know how the fog came ~

Let's explore it!

experiment equipment

The bid cup, electric kettle, glass container, soapy water, oil, moisturizing milk

experiment procedure

First of all, we use an electric kettle to burn the appropriate amount of water to about ninety degrees

Generate enough water vapor to accelerate the process of the experiment

Pay attention to safety in the whole process to avoid burns

Buckle the glass bowl

Instantly the glass bowl is foggy

This is the case even where there is water residue

Maybe you have heard such a way when you face the foggy fog: painting soapy water

Let's try it

In contrast, wipe it with the soapy water on the side of the bottom of the bowl with paper

The effect is still very good

The part of the soapy water is still clear and transparent

What if we continue to "steam" this glass bowl?

With more water steam pouring in

The originally protected part also began to be eroded by fog

In the last century, the aerospace helmet was divorced with electric wires and blowing into dry oxygen.

It will also cooperate

Misty dehomatas is a mixture of surfactants and oil

Although we can't prepare a stable dehomature

But we can add oil to the glass bowl of soapy water

Under the promotion of thermal airflow and gravity

Excess oil will gather together to flow outward

Display clean transparent surface

The oil body with flowing will flow with some soap fluids

Local fog appears more than pure soapy water

But the remaining places look more lasting

The part of the local fog is also thinner than before

A bit like a froster glass

As another group

We can also try to apply only oil

As a result, there is almost no anti -fog effect

However, the foggy drops will be more uniform than the dry part

Pay attention to the experiment to avoid making the water completely boiling

The boiling water vapor rises and cools into a larger droplet

Make the protective membrane quickly disintegrate

Similar to the dehuminiferous coatings that are close to oil and hydrophilic water

Xiao Bian looked at the house, his head was crooked

Can moisturizing milk have the power of one battle?

Try it as much as possible and try:

It seems that it still has a certain role

But I feel a bit myopia

Zoom in

Moisturizing milk makes the fog converge into a larger water droplet

So you can see the other side of the glass less clearly

Original understanding

The fog on the glass is composed of water vapor encounters cold liquefied small droplets. These small droplets are small radius. The surface with a large curvature makes the adjacent parallel light also parted ways after refraction, making it difficult for the objects behind the glass. Therefore, the overall overall The feeling of mist appears on the top. Then we make the water droplets larger, and the curvature becomes smaller? After all, if water is a complete layer of membrane, it should not affect the imaging too much.

The fog agent of the finished product is indeed using this principle to divorced. The surface tension is reduced through the action of surfactants or hydrophilic particles, so that liquefied water vapor forms a layer of water film instead of water droplets. However, when experimented at home, because the soapy water itself is not uniform, the lower concentration will gather after the natural evaporation. It is gradually "eroded". Adding an appropriate amount of oil is also the structure formed by some local medium water-soap-oil.

Review

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