I went online and found out a lot of information about boiling water. If you cover the tin and allow the water and air to cool down, the air will cool and contract, lowering the pressure in the tin. If it lowers enough, the partial vacuum will collapse the walls of the can! The boiling point definitely reduces with air pressure. There is a famous demonstration where boiling water or coffee is drunk, the trick is it was in a vacuum chamber where it boiled at room temperature. The actual definition of the boiling point of water is the temperature when the vapor pressure of the water equals the atmospheric pressure (the pressure of the air pushing down on the surface of the water). In the liquid, the water molecules are attracted to one another by their very nature and further held together by the pressure of the atmosphere pushing down on the surface of the liquid. As they are heated they gain energy to begin to pull away from one another. When they gain enough energy, they are able to separate and to overcome the force of the atmospheric pressure and form the gas (water vapor) that makes up the bubbles you see in the boiling process. The standard temperature at which this occurs is 100 C or 212 F. In the very early stages of heating, you may see some small bubbles even though the water is only warm. This is some air that is dissolved in the cold water and is being expelled by the heating. This is not boiling. As the water nears the boiling point, some areas of the container close to the heat source may be hot enough to cause some boiling in that area which produces some local bubbles. To be sure that all of the water is "at the boiling point," you should wait until there is a large amount of bubbles rising to the surface. The bubbles in boiling water are made of, air and/or water vapor, depending on how much air has been dissolved in the
Title: Boiling Red Water
A clear glass or plastic cup
Food Colouring (Optional) 1/4 cup
1 tsp Salt
Fill a glass 3/4 full with water
Add 5 drops of food colouring
Add the oil Add salt
How it works:
The salt brings the oil down with it as it sinks to the bottom of the bottle. When it reaches the water, the salt dissolves and the oil is then free to float back to the top.
NOTE: this is not originally….
matter in solids, liquid and gaseous states applied to the concept cartoons which are then compared to a child’s conception of the following scientific investigations; sugar added to a cup of tea, when water is boiling, and the reasons behind condensation on the outside of a glass filled with water and ice cubes. I am then to compared the 'correct ' answers to my child’s answers and explore where the child is coming from and why they believe their answer is correct.
The child I interviewed is….
3. Volume of the test tube. 9.032
4. Mass of the empty test tube. 10.35g
5. Mass of the filled test tube. 29.89g
6. Mass of liquid in test tube. 19.54
7. Temperature of the water. 22ºc
1. Mass of object. 6.87g 49.44g
2. Volume of the water in the graduated
Cylinder after the addition of the object. 17.5mL 19mL
3. Volume of the object due to displacement 2.5mL 4mL
4. Density of object. 2.748 12.36
SCIENCE PROJECTS:The Effect of Salt on the Boiling Temperature of Water(Initially prepared by a 4th Grade student)To quickly jump to a section below click on:INITIAL OBSERVATIONCooking instructions tell you to add salt to water before boiling it.PROJECT TITLEThe Effect of Salt on the Boiling Temperature of WaterPURPOSE OF THE PROJECTTo find out how table salt affects the boiling temperature of water.HYPOTHESISAdding table salt to boiling water will cause the water to boil at a higher temperature.MATERIALS….
"The Effect of Salt on the Boiling Point of Water"
How does adding salt to water affects it's boiling point?
In this paper, a newly proposed model based on solvation between pure solvent and salt for prediction of salt effect on vapor–liquid equilibria is presented by using only the vapor pressure depression data of pure solvent+salt systems that compose the mixed solvent with salt system
200 mL of distilled water,
5grams of salt….
2012-2013 Winter Break Homework Packet Prince George's County Public Schools Reading/English Language Arts Grade 9
GRADE 9 WINTER BREAK READING HOMEWORK PACKET
In Preparation for the Maryland High School Assessment, PSAT, and SAT
The enclosed activities are to be completed by your child during the Winter Break and he/she is encouraged to return it to his/her Reading/English Language Arts teacher upon return to school. Parents are encouraged to assist in the following ways:….
The Bunsen Burner and Boiling Water
The Bunsen Burner is a piece of laboratory equipment that produces a single flame which is used for heating, sterilizing, and combustion. The gas used in Bunsen burners can be natural gas like methane, or propane, butane, or a mixture of both which are all liquefied petroleum gas. The Bunsen burner was named after a man named Robert Bunsen. In 1855 Robert Bunsen invited the Bunsen burner and it is now used all over the world….
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, email@example.com 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….
BOILING AND CONDENSATION
• 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….
BOILING POINTS AND MELTING POINTS PART 2
Name: Grethel Zegarra
Date of Lab: October 26, 2010
Date lab is due: November 2, 2010
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.