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  • It's AumSum Time

  • Hey guys.

  • Hold on.

  • Now, let's guess the title of my next video.

  • Yeah.

  • He's a super dog.

  • Dogs' noses have more than 200 million sense receptors.

  • So, they have an extraordinary smelling ability.

  • Hurry up.

  • Wirte your guess in the comments section below.

  • Why does water dance on a hot pan?

  • Because it likes to sizzle.

  • And 100 degrees Celsius.

  • Get ready water droplets.

  • It's time to boil and evaporate.

  • Okay.

  • Let's cross 200 degrees guys.

  • It's so hot that the lower part of the water droplet immediately vaporizes.

  • Holy Moly.

  • What's that?

  • An insulating vapor pocket is created beneath the droplet.

  • And now?

  • The vapor molecules are trying to escape from it.

  • They are pushing the droplet around, making it dance.

  • This is called the Leidenfrost effect.

  • Topic: Buoyancy

  • Can you drown in the dead sea?

  • Your answer must be yes, right?

  • You must be thinking that anybody 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.

  • When an object is partly or wholly immersed in a fluid, an upward force is exerted by the fluid on that object.

  • This tendency of the fluid to exert an upward force on the object is called buoyancy or upthrust.

  • 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 in water and push it downwards.

  • What do you observe?

  • It 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: Kidney stones.

  • What causes kidney stones?

  • Swallowing a stone?

  • No.

  • Our kidneys filter blood by removing waste from it in the form of urine.

  • Urine consists of water, urea, uric acid and ions like calcium, sodium, oxalate and potassium.

  • However, when some of these constituents such as uric acid, calcium and oxalate ions increase in the urine.

  • They bond together forming kidney stones or renal calculi.

  • One of the most common kidney stones is calcium oxalate.

  • So can I use it to build my house?

  • Just listen.

  • Generally, the kidney stones are small.

  • Hence, they pass unnoticed through the urinary tract.

  • However, sometimes these stones become so big that they start to scratch walls of the urinary tract.

  • May block the path of the urine, thus causing immense pain.

  • Why do elephants have big ears?

  • To fly.

  • Not at all.

  • Ears basically help to hear.

  • Besides this, big ears of the elephants also help it to regulate its body temperature.

  • But how can ears help to regulate body temperature?

  • In living beings like elephants, blood supplies heat to all parts of the body.

  • Thus helping it to maintain the body temperature.

  • However, due to metabolic activities or hot climate, sometimes heat in the blood can increase.

  • Thus increasing the body temperature of the elephant.

  • Now an elephant's big ears are filled with blood vessels which are very close to the surface of the skin.

  • Hence, when blood having more amount of heat flows through the ears of the elephant.

  • The heat from the blood escapes into the atmosphere, cooling the blood and in turn cooling the elephant.

  • Is spicy food bad for you?

  • Obviously, becasue whenever I eat spicy food, my mouth seems to be on fire.

  • This is because spicy food generally contains chili peppers.

  • Chili peppers have a chemical called capsaicin.

  • When capsaicin comes in contact with our tongue.

  • It activates the heat sensing receptors instead of our taste buds.

  • As a result, our brain thinks that our mouth is on fire.

  • So, shall I call the fire brigade?

  • Just listen.

  • Capsaicin present in spicy food is not necessarily bad for everybody.

  • Only those people who have a low tolerance level.

  • Or don't have a habit of eating spicy food can experience some problems like burning mouth.

  • Irritation of the stomach lining, heartburn, etc.

It's AumSum Time

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B2 中高級 美國腔

為什麼水會在熱鍋上跳舞?| 我的天啊!我的天啊!我的天啊!我的天啊!我的天啊!我的天啊 (Why does Water Dance on a Hot Pan? | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日
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