Why We Can Evaporate?

Evaporate

           Surely if we were still sleepy, bored or tired, one thing is for sure we do is yawn. Moreover, if longer work and home are still waiting for a long time ..

felt within 15 minutes can evaporate more than 5 times ..

actually, why do we yawn?

        Actually, whether the symptoms of yawning? Is yawning identical with sleepy? Why could evaporate?


         Lots of scientists think about this yawning. From the point of evolution, or human development, meguap is a "relic"ancestor in the evolutionary process, at least we can also see animals also acts as a yawn.


         Other scientists believe that yawning is a way the body to overcome the lack of oxygen in the brain, at least that is what an American researcher named Gordon Gallup. He assumes that our brains are like computers that can "work" with both at a temperature of "cold". So to keep the brain temperature remained cold evaporated mechanism was needed.


          Other smart people believe that yawning is because the body's "forced" to get more oxygen to his lungs. So when the lungs due to certain conditions "shortage" of oxygen, the body through the brain will instruct the action had evaporated.


          As a courtesy ethical guidelines, you should not forget to shut your mouth when you yawn, and do not need to make a sound.


          Oh yes there is an interesting more about yawning, yawning is said it also "contagious". Try maybe there among you who have experience bandwagon evaporate if there is someone else yawn near you. Is it happening because both "need" oxygen? Or because of other reasons? How do you think?

Sumber : Kaskus.

Why Can Sea Water Salty?

 Sea

 

Its history ...


            Sea, was formed 4.4 billion years ago, which initially are very acidic with boiling water (with temperatures around 100 ° C) due to the heat of the earth at that time. Acid sea water occurs because the Earth's atmosphere was filled with CO2. Water acidity is what causes the high weathering and causing sea water to be salty as it is today. At that time, the tsunami waves often occur because of frequent asteroid struck the Earth. Ocean tides that occur at the time also of type mammoths or high / very high because of the distance the Moon is so close to Earth.

Why is sea water salty?


          Surely anyone who has ever asked such a ... And the answer must be because the fish in the sea of ​​urine, sweat because of heat and salt. Surely the answer is not wrong.


          Actually, the salty taste of sea water from virgin land, chronological way. At the time of rain on land water will seep into the soil and little by little will come out again through the dam rivers eventually reach the sea. Well on his way to the sea when the water from the mainland also bring mineral salts so that the sea filled with mineral salts.


           We know the sea has a surface which is so large that it is becoming one of the evaporation factor is quite large, when the sea water that evaporates simply evaporate H2O (water) being salt mineral salts remain with sea water, sea water so that it taste so salty. Levels of salinity of sea water is influenced by the temperature factor, usually the hot region increasingly salty seawater. Then why the water in the lake water does not taste salty but also from the mainland? The answer is because the lake water surface evaporation is not large enough so as not very big, meaning the water that evaporates with the water entering the lake is still balance and mineral resources are very limited unlike marine mineral resources from around the world into one.


           Sea water is water from the sea or ocean. Sea water has an average salinity of 3.5%. This means that in 1 liter (1000 mL) of sea water contained 35 grams of salt (mainly, but not all, salt / NaCl).


          Although most of the world's sea water has a salinity of about 3.5%, sea water is also different salt content. Most freshwater is in the eastern Gulf of Finland and the northern Gulf of Bothnia, both part of the Baltic Sea. The most salt is in the Red Sea, where high temperatures and high evaporation make limited circulation and little input of water from the rivers. Salt levels in some lakes may be higher.


         Sea water has a salt content because the Earth is filled with mineral salts contained in rocks and soil. For example sodium, potassium, calcium, etc.. If the river water flowing into the ocean, it brings salt water. Ocean waves hitting the shore can also produce salt found in rocks. Over time menjdai salty sea water because many contain salt.