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GASES NATURE DENSITY[V.D o   of air =14.4] SOLUBILITY[in water] NITROGEN Neutral Colourless Odourless Tasteless Non-toxic V.D = 14 – almost equal to air 100 volumes of water dissolves about 2.3 volumes at 30 o C. Slightly soluble. OXYGEN Neutral Colourless Odourless Tasteless Non-toxic V.D = 16 - 1.1 times heavier than air 100 volumes of water dissolves about 4 volumes at S.T.P   --- Slightly soluble CHLORINE Acidic Greenish yellow Choking odour Sour taste Poisonous/Toxic V.D=35.5 2.5 times heavier than air. 1 volume of wate dissolves avout 2.7 volumes at 15 ­ ­ o C. Fairly soluble CARBON MONOXIDE Neutral Colourless Odourless Tasteless Poisonous V.D = 14 Almost equal to air. 100 volumes of water dissolves about 3.5 volumes at 0­­ o C -slightly soluble CARB

Acknowledgement format I convey my gratitude to my respected subject teacher ________________, department of__________________ of (school name) for giving me this opportunity and also for his or her guidance in preparing this project. I also like to express my sincere thanks to my parents and others who helped me to complete this project in limited time frame. Last but not the least; I acknowledge the help offered by my friends of class___________ to complete the project. ________________                                                                ________________                                                                       Student signature                                                                     teacher’s signature                                                                                                                                        

Black holes are among the strangest things in the universe. They are massive objects – collections of mass – with gravity so strong that nothing can escape, not even light. The most common types of black holes are the stellar-mass and supermassive black holes. Stellar-mass black holes are created when massive stars explode, leaving behind a black hole with the mass of just a few suns. Supermassive black holes exist in the hearts of galaxies and usually contain the mass equivalent of millions of suns. Famous Black Holes Cygnus X-1:  a stellar-mass black hole and x-ray source that lies some 6,500 light-years away. It is a binary system that contains a blue supergiant variable star and the x-ray source thought to be the black hole. Sagittarius A*:  the supermassive black hole at the heart of the  Milky Way Galaxy . It lies in the direction of the constellation Sagittarius. This black hole contains the mass of about 4 million suns. M87:  this elliptical galaxy has a 3.5 bil

Hiding black hole found Date: February 28, 2019 Source: National Institutes of Natural Sciences Summary: Astronomers have detected a stealthy black hole from its effects on an interstellar gas cloud. This intermediate mass black hole is one of over 100 million quiet black holes expected to be lurking in our Galaxy. These results provide a new method to search for other hidden black holes and help us understand the growth and evolution of black holes. Astronomers have detected a stealthy black hole from its effects on an interstellar gas cloud. This intermediate mass black hole is one of over 100 million quiet black holes expected to be lurking in our Galaxy. These results provide a new method to search for other hidden black holes and help us understand the growth and evolution of black holes. Black holes are objects with such strong gravity that everything, including light, is sucked in and cannot escape. Because black holes do not emit light, astronomers must infer their ex