[Music] it's um sometime why Atlantic and Pacific Oceans don't mix simple because I'm some standing in between ah um some the answer is density density is the measure of mass present per unit volume lesser the density lighter will be the object the Atlantic ocean contains much more salt as a result of which it is much denser on the other hand the water in the Pacific Ocean is less salty hence its density is much lower hmm now this difference in density due to salinity creates a kind of barrier c
alled a Halo Cline be between the two oceans as a result both the oceans don't mix that easily hmm to buy um some merchandise visit umsum.com topic buoyancy [Music] hmm oh can you drown in the Dead Sea your answer must be yes right you must be thinking that anyone who cannot swim will obviously drown whether it is a swimming pool or the Dead Sea however that is not 100 True confused let me explain to you [Music] when an object is partly or wholly immersed in a fluid an upward force is exerted by
the fluid on that object of the fluid to exert an upward force on the object is called buoyancy or up thrust this upward force is called buoyant force so do you finally get it let me give you one more example place a piece of wood and water and push it downwards what do You observe seems like something is pushing the piece of wood upwards right water exerts an upward force on the wood that is why the wood is getting pushed upwards this force is called buoyant force and the tendency of water to
exert that buoyant force is called buoyancy Dead Sea has a huge amount of salt dissolved in it as compared to any other sea or ocean the presence of this salt increases density of water present in the Dead Sea higher density leads to Greater buoyant force as the Dead Sea has very high density it exerts enough amount of buoyant force to make us float on it so if we can float on the Dead Sea we are definitely not going to drown in it topic Newton's third law of motion [Music] why does a swimmer pu
sh the water backward [Music] oh no there's a hole in the boat now how will you reach the shore don't worry do as I say jump in the water and push the water backward with your hands this will help you to move forward towards the shore oh no you are not pushing the water backward see you are moving forward towards the shore [Music] do you know why you were able to move forward by pushing the water backward [Music] to understand this you need to learn about Newton's third law of motion [Music] hoo
ray oh Newton's third law of motion states that for every action there is an equal and opposite reaction nah not that action wait let me explain when we swim we apply force and push the water backward with the help of our hands this is action in response to this action the water pushes us forward with an equal force this is reaction thus in order to move forward and swim the swimmer pushes the water backward s topic osmosis how do fish drink water that's easy using a straw no fish taking water u
sually through their mouth or gills depending on whether they live in fresh water or salt water freshwater fish takes in water mainly through its gills but why because it has less water and more salt concentration in its blood than the surrounding water and due to osmosis water from the surrounding flows through the gills into its bloodstream however as the fish is continuously taking in water it urinates a lot and removes excess water okay saltwater fish takes in water through its mouth oh real
ly this is because its blood has more water and less salt concentration than the salt water around it hence to maintain the balance the fish sculpts salt water through its mouth filters the water for its use and expels excess salt while urinating Archimedes principle huh Why do ships float good question give me minimum five years to unravel its mystery huh all right don't bother to answer this question we need to understand Archimedes principle Archimedes principle states that an object partly o
r fully immersed in a liquid experiences an upward Force called buoyant force which is equal to the weight of the liquid displaced by it oh man it is too complicated okay wait I'll explain a ship has a long and wide base due to which the amount and the weight of water displaced by it increases now according to Archimedes principle the buoyant force is equal to the weight of displaced liquid hence as the weight of displaced water increases the buoyant force that is the upward force exerted by the
water increases making the ship float why is the ocean blue cause ocean water reflects blue color of the sky you are right but not completely the main reason for oceans to be blue is the way water molecules absorb and Scatter the colors of sunlight sunlight has seven visible colors they are red orange yellow green blue indigo and violet yeah I now when sunlight falls on the ocean it passes deep into the water here red orange yellow and green colors of sunlight are absorbed more strongly by wate
r molecules While Blue Indigo and violet colors are not absorbed much instead they are scattered making the ocean appear blue to us however as the blue Shades penetrate deeper into the ocean eventually they also get absorbed hence at greater depths the ocean is completely dark hmm what is a tsunami I don't know tsunami is a series of giant waves in Japanese tsunami means Harbor way and in Chinese oh just listen a wave is created when energy passes through water moving air or wind provides energy
to water forming regular waves hmm while on the ocean floor when a tectonic plate suddenly slides beneath the other the resulting earthquake releases a tremendous amount of energy this energy spreads outward from the point of earthquake triggering waves that can form tsunami initially these waves are small in size but they travel at Great speeds however when the waves approach the shore the rising seabed obstructs the energy of waves slows down the speed of waves but the energy flux must remain
constant leading to an increase in the height of waves thus resulting in tsunami how do dolphins sleep by covering their face with fins no huh like humans dolphins are mammals they breathe through lungs hence dolphins need to come up to the surface of water at regular intervals to breathe also dolphins have to protect themselves from dangerous predators hence they always need to be alert just like security guards right oh just listen each eye of a dolphin is directly connected to the opposite h
emisphere of the brain now while sleeping a dolphin shuts down one Hemisphere and the opposite eye in the meantime the other active hemisphere keeps track of internal bodily functions like breathing and the open eye looks out for Predators after two to four hours the dolphin swaps the sleeping task it awakens the closed eye and the resting Hemisphere and shuts down the active Hemisphere and the Open Eye this type of sleep is called uni hemispheric slow wave sleep foreign can jellyfish live forev
er to understand this let us observe the life cycle of a jellyfish a fertilized egg of a jellyfish forms planula planula then attaches itself to a hard surface like a rock or seafloor then it transforms into Apollo then through a process called budding tiny jellyfishes emerge from the polyp some jellyfishes may live for a few hours some may live for a few months while some may live for several years however a type of jellyfish known as turretops is stormy which is also called the immortal jellyf
ish is said to live forever oh stop bluffing how's that possible when the immortal jellyfish is injured stressed or cannot find enough food it reverses its life cycle it transforms into a blob-like structure called cyst which then transforms into a polyp then again through budding tiny jellyfishes emerge from the polyp thus making turatopsis during immortal foreign [Music]
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