Scientific common sense is all around us, see if there's anything you don't know?

Hello everyone, in last issue you received first issue of a small scientific experiment, this issue is second issue, haven't you learned some useful knowledge from it? The editor is also honored to provide you with more useful knowledge. Without further ado, let's get started.

First: heating effect of electric current

If we use a conductor to connect positive and negative poles of battery, it will cause a short circuit and temperature will rise if current load is too high, causing match to ignite.

Second: refraction of light

The refractive index of salad oil is almost same as that of glass. Light does not reflect at their border, and reflected light does not enter our eyes. We cannot see a small glass inserted into a large glass.< / p>

Third: surface tension of bubbles

Due to surface tension (the force of molecules on surface of bubble wrap), surface area of ​​the bubble wrap tends to shrink, causing cotton thread to be pulled outward, so loose cotton thread becomes round after tightening.

Fourth: principle of floating handwriting

Oil-based pen pigment is insoluble in water. At same time, density of oil-based pigment material is lower than that of water, so pen pigment will float on surface. When painting objects with oil-based pigments applied, pattern separates and forms a water surface pattern.

Fifth: siphon principle

The siphon is a force phenomenon that uses difference in liquid level. Place top end of hole in a container filled with liquid, and liquid in container will continue to flow to down position through siphon tube.

Six: electrostatic principle

After balloon is rubbed, there will be many negative charges on surface. Charged objects have property of attracting light and small objects, so when balloon slowly approaches bubble, it will attract bubble to move. .

There are six practical tips above, more tips will be updated later, hope you can help me pay attention and not get lost! ! I wish you all a happy life. For more tips, please go to homepage to have a look.

Extended reading

I will tell you about some of scientific knowledge that is widely used around us

Today I will teach you how to organize and store clothes and bedding at same time

Small life tips that you can learn once you learn them, it is recommended to save them for your family