Hands full of germs

Washing your hands before eating is necessary to eliminate parasites invisible to the naked eye. Is it enough to pass them underwater? Or is soap necessary? That’s what you will discover by doing this fun experiment at home.

You will need:

From 5 years

Difficulty : easy

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Let's experiment

  1. In a plate, pour the glitter of the color of your choice. You can even mix colors to make it more fun.

2. Place your hand flat on the plate containing the glitter and observe. Your hand sparkles with a thousand lights thanks to the glitter stuck on your palm.

These glitters represent the bacterial film naturally present on your skin.

3. Go, put your hands all over your place. In the kitchen for a drink. On the wall, on the sofa, on the table or on your face. You can also take your pencils, your eraser and sheets of drawings to occupy or play with your games. Also, shake hands with your siblings or scratch your nose.

4. Let’s move to the cleaning phase.

Just dip your hands in a basin of water and watch. Does the glitter go away?

5. Repeat the same but with the use of soap. What do you observe?

The glitter leaves more easily, however, there is still some left on your palms.

That’s why, when you wash your hands, you have to do it longer.

Soap allows the glitter to go away, and it’s the same observation you could make with bacteria and viruses.

This experience helps you understand the importance of proper handwashing. Because we deposit germs on everything we touch. These germs are naturally present on the palms of our hands, just like glitter.

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What are viruses and bacteria ?

Viruses and bacteria are microscopic germs, invisible to the naked eye. Most of them are harmless. They are even beneficial to our health. But some cause diseases such as influenza, measles, or other more serious pathologies.

Unlike bacteria, viruses are not living things. They are simply DNA molecules covered with a protective layer of fat and protein, which form an envelope. The way they work is to penetrate our cells and turn them into a factory for producing viruses.

Understand the experience?

Glitter illustrates the bacteria and viruses that naturally live on our hands. By touching different objects in your daily life, such as door handles, cupboards, glass, or colored pencils, you deposit these germs on them as you have seen through this experiment.

These bacteria and viruses naturally colonize our skin. These germs are part of our natural flora and contribute to our health. Most of them are not dangerous.

However, germs like the flu virus or other infectious diseases can cause illness. If you are sick, it is important to wash your hands properly and avoid spreading them everywhere you go. Otherwise, others will be infected by being in contact with things you have touched.

Yes, some bacteria and viruses can survive for several hours on a doorknob or the edge of a glass of water. That’s how they pass from one person to another. It’s called contagion.

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Understand the experience of washing hands.

In your experiment, you found that washing your hands only with water is not enough to remove all of the glitters. On the other hand, with soap, it seemed to be more effective. It’s the same with germs.

Soap is more useful because it helps to remove fatty substances, food residues, paint, glitters … by rinsing your hands, water also takes germs with it more effectively.

Why? Because soap is made up of molecules that love both water and oily media. The envelope of bacteria and viruses and composed of a bilayer of fatty substances. Soap gets into this bilayer to break it down. And that’s how viruses and bacteria can be removed more effectively with soap.

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How often should you wash your hands?

It is not useful to wash your hands 15 times a day. Reserve these moments of hygiene after going to the toilet, before preparing a meal or if you have been in contact with someone sick.

Washing your hands too often dehydrates our skin and makes it more fragile in the face of invasions of outside germs.

On the other hand, when we are sick, we also carry these germs in our hands. Whenever you cough in your hands, you should wash them before spreading the bacteria everywhere.

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Is water killing viruses?

Water does not kill viruses and bacteria. It’s just a mechanical effect. When water flows on your hands, it takes with them certain waste to be eliminated, and bacteria with it. But not all.

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