 channel for physics. Please subscribe my channel. Hello and welcome back to another episode of physics partner. Today I brought some unbelievable very interesting fact. If you somehow remove all the empty spaces in our human body atom, the whole humanity volume will be reduced till a small dies. The atoms that make up all the stuff around us seem solid but in fact over 99.99999% empty space. An atom consists of a very tiny dense nucleus surrounded by a cloud of electrons spread over a proportionally enormous range. They thus occupy a huge amount of space. So if we remove this space the whole humanity volume will be reduced till a small dies. Fact number two black holes are not black. They are very dark. Sure the gravity is extremely high so nothing even light cannot escape from there but they are not black. They glow slightly giving off light across the whole spectrum including visible light. This radiation is called Hawking radiation. Fact number three run. Run a lot and gain more mass. Surprising people usually run so that they can lose some body weight and be slim but according to the physics concept of variation of mass with the speed the more you speed the more mass you gain. It is mathematically and experimentally proven fact but don't worry the mass you gain is negligible. To gain a noticeable mass you should travel close to the speed of light. Fact number four the whole observable universe is less than 5% of the total. The universe we know is so gigantic observing many celestial objects just look at earth only. It is so big that you cannot completely explore it but is that all? No the whole observable universe is less than 5% of the entire universe. Now a question arises what are other things that we cannot see? They are dark matter and dark energy. These forms of matter energy are not observed but needed so that our observations come in accord with our knowledge. Fact number five some particles can communicate faster than light according to Albert Einstein nothing can travel faster than light but in the quantum world particles are able to form such communication known as quantum entanglement. They can do this communication faster than light. Two entangled particles can share information instantaneously irrespective of the distance between them. Fact number six time freezes inside the black hole. One of the most revolutionary discoveries of the 20th century was the relativity of time. Time freezes inside the black hole not for the one who is falling in the black hole but a distant observer that time inside freezes. This is possible due to gravitational time dilation for black holes time a second becomes infinitely long that there exists singularity meaning time tends to freeze. So a distant observer would observe time nearly paused or frozen inside a black hole just like a movie. Fact number seven such and can be a boat in water. Saturn is a huge planet the second largest among eight planets in the solar system but the density of Saturn is less than water. So according to the theory of floatation if we manage the amount of required water Saturn can float in water and we can use it as a boat. The density of Saturn is 0.7 and the density of water is 1. Fact number eight rubber is less elastic than steel. Yes that's true we generally understand that material is elastic if it is stretchable and regains its shape quickly when the stretching force is removed but according to physics steel is more elastic than rubber. This is the reason why it is used for making bridges and buildings. They deform it can quickly regain its original shape better than rubber. Fact number nine a wristwatch on Jupiter runs slower than on earth. Yes that's true according to gravitational time dilation the higher the gravitational field slower runs the time. If we compare Jupiter and earth Jupiter is massive and hence has a stronger gravitational field than the earth. So according to physics a clock must run slower in Jupiter than on earth. Fact number 10 water can boil and freeze at the same temperature. Actually decreasing pressure can lead to a decrease in boiling point and increase in freezing point. So at the temperature of 723.16 Kelvin 0.01 centigrade or 32.02 Fahrenheit of 0.006 Pascal water can freeze as well as boil. All three states of water coexist. This is not only true for water but the other matters too. Thank you very much for listening. I hope you enjoyed the video and see you in the next video. Goodbye.