(1) Evaporation: Surface Area: Evaporation is surface phenomenon.Greater is surface area greater is evaporation and vice versa.For example‚ sometimes a saucer is used if tea is to be cooled‚ quickly.This is because evaporation from the larger surface area of saucer is more than that of the smaller surface area of the tea cup. Temperature: At high temperature‚ rate of evaporation is high because at high temperature
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BOILING AND CONDENSATION BOILING • Phase change phenomenon where in transformation of liquid to vapour occurs at the saturation temperature of the fluid. It occurs at a solid/liquid interface due to convection heat transfer from the solid and usually occurs at surface temperatures higher than the saturation temperature of the fluid Agitation of fluid by vapor bubbles provides large convection coefficients Modified Newton’s law of cooling qs’’ h Ts Tsat Te • • • BOILING – CLASSIFICATON
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BOILING POINTS AND MELTING POINTS PART 2 Name: Grethel Zegarra Date of Lab: October 26‚ 2010 Date lab is due: November 2‚ 2010 HYPOTHESIS The boiling point in degrees Celsius will increase as the number of carbon atoms increase. The melting point of the unknown will indicate its mixed substances. The boiling point will increase as a result of the different branching of the OH‚ the melting point will be affected by the different positioning of the OH on the benzene ring. PURPOSE To introduce
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SHORT INTRODUCTION TO TWO-PHASE FLOWS Condensation and boiling heat transfer Herv´ Lemonnier e DM2S/STMF/LIEFT‚ CEA/Grenoble‚ 38054 Grenoble Cedex 9 Ph. +33(0)4 38 78 45 40‚ herve.lemonnier@cea.fr herve.lemonnier.sci.free.fr/TPF/TPF.htm ECP‚ 2011-2012 HEAT TRANSFER MECHANISMS • Condensation heat transfer: – drop condensation – film condensation • Boiling heat transfer: – Pool boiling‚ natural convection‚ ´bullition en vase e – Convective boiling‚ forced convection‚ • Only for pure fluids. For mixtures
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RESEARCH PAPER IN PHYSICS By: Sharmaine Joyce T. Sebastian B.S PT 2A2-1 College of Physical Therapy Sebastian‚ Sharmaine Joyce T. December 2‚ 2013 1. Why an ice cube at 0°C is more effective in cooling soft drink than the same mass of water at 0 °C? Enthalpy of fusion is the change in enthalpy resulting from heating a given quantity of a substance to change its state from a solid to a liquid. The temperature at which this occurs is the melting point would
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to freeze more than that‚ do it in subsequent one-pound batches. Lower the taro into vigorously boiling water. Cover the pot and allow the water to return to boiling. Step 4 Boil the taro over high heat for exactly five minutes. Step 5 Put a pound of ice into a sink or basin while the taro is boiling. Add about a half a gallon of cold water. Step 6 Lift the basket from the pot‚ allow the boiling water to drain out and then plunge the basket into the ice water. You may want to toss some ice
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In his article David Foster Wallace proposes that the world’s largest lobster-eating celebration may actually be a massive animal-abusing process comparable to the cruelty to that of the Aztec’s human-sacrificing ritual. Wallace introduces Maine’s annual Marine Lobster Festival (MLF) held in late June attracts thousands of tourists seeking to devour the “steak meat” of the Atlantic Ocean – lobster. A lobster is a crustacean‚ existing in the region since colonial times with such abundance that early
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8100 J were needed to distil 2.95g of water. a) Explain why the boiling tube was surrounded with expanded polystyrene (or other similar insulation)‚ but the condenser was left uncovered. b) Before any water was collected‚ the water was allowed to boil for several minutes until drops steadily fell from the condenser. Explain why this helps achieve greater accuracy when estimating ∆Hvap. The table below lists values for ∆Hvap and boiling point (Tb) for water and four organic compounds. Liquid Formula
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different ways (taken from other cooking forums) of removing the wax coating from lemons. Pouring boiling water over In a bowl with (initially) boiling water for five minutes Scrubbing with warm water and dishwashing liquid Scrubbing with warm water and ascorbic acid Scrubbing with warm water and baking soda. After each trial I rubbed the lemons with a tea cloth. The methods involving boiling water produced slightly tacky‚ but less glossy lemons. The other methods made no obvious difference
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take for granted. If you are camping and hiking you won’t always have access to this source of healthy‚ potable water. Unfortunately‚ many water sources in the wilderness include microorganisms‚ bacteria‚ viruses and contaminants. 1. Boiling * Boiling water is the most effective way to kill all disease-causing microorganisms‚ such as E. coli‚ Cryptosporidium and Giardia lamblia‚ which are present in lakes and rivers. Depending on your elevation level‚ you should boil water for different
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