National Bird Day is celebrated every year on 5 January . This day is observed to spread awareness about birds, their importance in nature, and the need to protect them. Birds are beautiful living beings and play a very important role in keeping our environment healthy. Origin of National Bird Day National Bird Day was first celebrated in the year 2002 . It was started by bird lovers and environmental groups to protect birds from dangers like deforestation, pollution, and illegal hunting. The main aim of this day is to teach people, especially students, why birds are important and how we can help save them. Why Is National Bird Day Celebrated Every Year? National Bird Day is celebrated every year because many bird species are disappearing due to human activities. Cutting trees, using plastic, pollution, and climate change are harming birds and their homes. This day reminds us that: Birds need protection Nature should be respected Everyone has a responsibil...
Andrews experimental PV curve and state of continuity The slope of tangent drawn on critical point is opposite on either side of this point. The isothermal curve touching the critical point is critical isothermal. The temperature, pressure and volume corresponding to critical point are known as critical temperature (T c ), critical pressure (P c ) and critical volume (V c ) respectively. P c , V c and T c are combindly known as critical constants. Conclusion of Andrews experimental curve Any gas can be liquified below its critical temperature. Every gas has a critical temperature above which the gas can not be liquified by increasing pressure. At critical temperature, the density of liquid and its saturated vapour are equal. Above this temperature we can not distinguish between the two states. Near critical temperature, the compressibility of gas is very high and it become infinitive at critical temperature. Above critical temperature, the gas behaves as permanent gas....