Explain why a constriction is provided in a clinical thermometer, consiering the fact that during expansion mercury level while increasing passes through the sae constriction.

Why is a constriction provided in a clininal thermometer?

The speed of a liquid flowing through a pipe increases and its pressure decreases when liquid passes through a narrow constriction in the pipe. Why?

Speed Post Leads the Race in Express Mail Speed Post has emerged as a market leader in the express mall category with a 27.55% volume share, a study commissioned by the Department of Post (DoP) and government of India shows. According to the study, almost 46.67% crore articles were sent by express mail in 05-06 . The study values the express mail industry alone (excluding logistics and cargo which account for almost 35-40% of private firm's turnover) at around 1500rs crore. In volue terms, while Speed Post is the leader, Blue Dart is a close second with a 20% market share, followed by DTDC with a 11.91% share and First Flight with a 10.89% share. "This has been possible because of our competitive pricing. We are offering the same services as other private couriers do, with the same efficiency but at half the rates", added Mr. Samuel. In fact, Speed Post claims that its volumes have increased by almost 30-40% after the introduction of the One India One Rate scheme. Express companies are hope ful that the market is going to groq further with the setting up of SEZs and greater economic activity in the country fuelled by the increasing through out from the manufacturing sector. Mention the type of product provided by Speed Post.

Why does the mercury level not fall on its own when the bulb of a clinical thermometer is removed from the mouth ?