We all are well aware that every day and every minute we are surrounded by Science. But, seldom people make an effort to know what the hidden science behind daily life happenings is. And am sure you will be just amazed to know the science behind these everyday things.
- Why does egg harden on boiling?
Egg contains 33 percent fat and 67 percent protein in it. This protein rich egg white causes the egg to harden when boiled.
But why does it happen so?
When eggs are heated the proteins in the egg white are unfolded due to break of amino acids. So, as the temperature increases these unfolded amino acids form stronger covalent bonds with other protein molecules. And eventually all the unfolded molecules connect to each other and becomes hard.
Thus egg becomes hard on boiling.
- Though soaps have different colour, why is the soap lather always white in colour?
Foam and lather given out by soap is nothing but soap bubbles formed by soap solution. The large collection of these soap bubbles together form lather. And when the soap is mixed with water it gives out the soap solution which stretches and forms this lather of air soap bubbles. When light strikes these soap bubbles, it gets scattered in all the directions and makes the lather appear white in colour, irrespective of the colour of soap.
- Why does chalk piece emit bubbles when immersed in water?
Putting chalk into water and watching the bubbles rise was no less fun in childhood days. Many people would have done this too! In that tender age we only viewed it as a magic, little did we know the science behind it.
It has a very simple reason behind it. Chalk piece is a porous material and when put into water, all the water enters through these capillaries. The water inside the chalk pushes all the air outside and it comes out in the form of bubbles.
- Why does cooking in pressure cooker take less time than others?
Pressure persists in every other thing of our surrounding. Similarly we use the same pressure concept to cook our food too. Have you ever observed that cooking in pressure cooker consumes less time than cooking it in open without any pressure. Why is it so?
So when the water inside cooker is pressurised, boiling point of that water increases and cooking happens quickly. Meanwhile, it takes a lot of time for the water to boil when not cooked in pressure. In order to save time and fuel, it is recommended to use pressure cookers in place of regular vessels.
- Why is the gunman pushed back slightly when gun is fired?
If you have seen any action movies or notices our army man in action with their guns, you would have probably noticed this action. What do you think is the reason behind it?
Well, it all happens as stated in Newton’s Laws. When the bullet leaves the nozzle of the gun with force, the gun handle pushes the gun man back due to recoil momentum. This action is a result of Newton’s third law that states, “Every action has equal and opposition reaction”.
- Why is fire hot?
Any chemical reactions will be either exothermic reaction which liberates heat or endothermic reaction which absorbs heat. So all the oxidation reactions are exothermic and all reduction reactions are endothermic.
Fire is a result of combustion, which is an oxidation reaction. Thus combustion reaction gives out heat.
- How does scratching give relief for itching?
We all know that scratching is a cure for itching. But have you ever thought why it happens so?
Scratch action is an important reflex of spinal cord. Itch and tickle sensation initiates this reflex action. So by scratching it is possible to find the exact position of irritation in happening in the body with to and fro movement at that area. This scratching action removes irritants and itch is relieved. Hence, by the process of lateral inhibition pain signals are suppressed itch signals in the cord.