The blue whale is a marine mammal belonging to the suborder of baleen whales called Mysticeti. It length 30 meters and 150 metric tons or more in weight, it is the largest known animal to have ever existed.
The blue whale has a long tapering body that appears stretched in comparison with the stockier build of other whales. The head is flat, U-shaped and has a prominent ridge running from the blowhole to the top of the upper lip. The front part of the mouth is thick. The dorsal fin is small visible only briefly during the dive sequence. It varies in shape from one individual to another, some only have a barely perceptible lump, but others may have prominent and falcate dorsals. When surfacing to breathe, the blue whale raises its shoulder and blowhole out of the water to a greater extent than other large whales, such as the fin whales. Observers can use this trait to differentiate between species at sea. Some blue whales in the North Atlantic and North Pacific raise their tail fluke when diving. Its lung capacity is 5.000 liters. Blue whales have twin blowholes shielded.
The flippers are 3–4 meters long. The upper sides are grey with a thin white border, the lower sides are white. The head and tail fluke are generally grey. The whale's upper parts, and sometimes the flippers, are usually mottled. The degree of mottling varies substantially from individual to individual. Some may have a slate-grey color, but others have a variation of dark blues, greys and blacks, all tightly mottled.
There were 5.000 to 12.000 blue whales worldwide, located in at least five groups. Before whaling, the largest population was in the Antarctic, numbering approximately 239.000. There remain only much smaller around 2.000 concentrations in each of the eastern North Pacific, Antarctic, and Indian Ocean groups. There are two more groups in the North Atlantic, and at least two in the Southern Hemisphere.
********************
Paris is the capital of France and the heart-throb of Europe. Paris is a beautiful and a romantic city situated on the river Seine. It is an important center for culture, politics, education, entertainment, media, fashion, arts and possesses several iconic landmarks.
The whole city is so lively and cheerful and the aura increases gradually as it gets darker and the city starts to twinkle like the stars and appears even more beautiful at night. The City of Paris has an estimated population of 2.153.600 within its administrative limits. The Paris unite urbaine is an area of unbroken urban growth that extends well beyond the administrative city limits and has a population of 9.93 million. A commuter belt around the unite urbaine completes the Paris metropolitan area, that with its population of 12 million is one of the most heavily populated areas in Europe.
Arc de Triomphe is the place which was constructed by Napoleon, Notre Dame, which is not only a masterpiece of French Gothic architecture, but has also been Catholic Paris ceremonial focus for several centuries. The Museum Louvre housed in Louvre Palace consists of the very famous Lovure Pyramids, Egyptian monuments, decorative arts and paintings and the very famous and beautiful painting of Mona Lisa.
 |
| Arc de Triomphe |
 |
| Museum Louvre housed |
 |
| Inside the Museum Louvre housed |
The Paris Region hosts 36 of the Fortune Global 500 companies in several business districts, notably La Defense, the largest purpose built business district in Europe. Paris also hosts many international organizations such as UNESCO, the OECD, the ICC and the informal Paris Club.
Paris is the most popular tourist destination in the world, with over 30 million foreign visitors per year. There are numerous iconic landmarks among its many attractions, along with world famous institutions and popular parks.
********************
Air conditioning is the process of altering the properties of air to more favourable conditions. More generally, air conditioning can refer to any form of technological cooling, heating, ventilation, or disinfection that modifies the condition of air.
An air conditioner is a home appliance, system, or mechanism designed to change the air temperature and humidity within an area that used for cooling and sometimes heating depending on the air properties at a given time.
The basic concept behind air conditioning is known to have been applied in ancient Egypt where reeds hung in windows had water trickling down. The evaporation of water cooled the air blowing through the window, though this process also made the air more humid. The first air conditioners and refrigerators employed toxic or flammable gases, such as ammonia, methyl chloride, or propane that could result in fatal accidents when they leaked.
In the refrigeration cycle, a heat pump transfers heat from a lower-temperature heat source into a higher-temperature heat sink. Heat would naturally flow in the opposite direction. This is the most common type of air conditioning. A refrigerator works in much the same way, as it pumps the heat out of the interior and into the room in which it stands.
This cycle takes advantage of the way phase changes work, where latent heat is released at a constant temperature during a liquid or gas phase change, and where varying the pressure of a pure substance also varies its boiling point.
Tidak ada komentar:
Posting Komentar