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From Wikipedia

Pressure experiment

Pressure experiments are experiments performed at pressures lower or higher than atmospheric pressure, called low-pressure experiments and high-pressure experiments, respectively. Pressure experiment are necessary because substances behave differently at different pressures. For example, water boils at a lower temperature at lower pressures. The equipment used for pressure experiments depends on whether the pressure is to be increased or decreased and by how much. A vacuum pump is used to remove the air out of a vacuum vessel for low-pressure experiments. High-pressures can be created with a piston-cylinder apparatus, up to 50.000 bar and ~2000degrees C. The piston is shifted with hydraulics, decreasing the volume inside the confining cylinder and increasing the pressure. For higher pressures, up to 250.000 bar, a multi-anvil cell is used and for even higher pressures the diamond anvil cell. The diamond anvil cell is used to create extremely high pressures, as much as a million atmospheres, though only over a small area. The current record is 5.6 Mbar, but the sample size is confined to the order of tens of micrometres.



From Yahoo Answers

Question:I need help with this lab write up Im not quite sure how to start this out and also any ideas for the procedure.. P.s. we have to measure the temperature in Celsius every 30 seconds for both substances

Answers:A hypothesis is an educated guess. Isopropyl alcohol boils at a lower lower temp

Question:When boiling water (usually for pasta) why do instructions ask for salt to be added to the water, what does the salt do? It occured to me that I always add the salt and have no idea why :)

Answers:I always thought that adding salt to boiling water helped bring out the flavor of whatever food was going to be prepared. However, adding salt also to boiling water will also cause the water to boil at a higher temperature and (presumably) cook the food faster. Here's a fun experiment to show that this happens: Problem: How does table salt affect the boiling temperature of water? Research: Many cooking recipes give you the instruction of adding salt to the water when boiling something. This can do many things to the water and there must be a special reason why they tell you to add salt to the water. This experiment will show us how salt affects the temperature of boiling water. Hypothesis: Adding table salt to boiling water will cause the water to boil at a higher temperature. Material: Table Salt Distilled Water 2 Quart Cooking Pot Pint measuring cup Teaspoon and tablespoon measuring spoons Thermometer Stirring spoon Procedure: 1. Boil one quart of distilled water on a stove. 2. Measure the temperature of the boiling water. Record the highest temperature reading. 3. Measure out table salt using a kitchen measuring spoon. Level the spoonful. 4. Add the measured salt to the boiling water and stir. 5. Measure the temperature of the boiling water with the salt in it. Record the highest temperature reading. 6. Repeat it now with two spoons of salt. Record And Analyze Data: Temperature of Boiling Water 212.9 F Amount of salt added the first time 1 spoon full Temperature of boiling water after salt was added 215.6 F Amount of salt added the second time 2 spoon fulls Temperature of boiling water after salt was added the second time 218.3 F Hope this answers your question!

Question:And what exactly is going on when I add salt to a bath of boiling water? A bunch of bubbles form and settle almost instantly. Why?

Answers:the salt molecules insulate and slow the energy transfer between the H2O molecules. and i have no idea about the bubble thing... in my experience, almost everything bubbles when you put it in boiling water

Question:An unknown volatile liquid was evaporated in a lab experiment but I can't figure out why the temp of boiling water was used in the mw equation when the unknown was weighed at room temp. Thanks for any help you can offer!

Answers:The temperature of the boiling water (373 K) = temperature of the vapor in the flask. The mass of the sample doesn't depend on temperature.

From Youtube

Boiling water using ice :An experiment done by my group during my school's science fair. Precedure: 1. Boil water until it boils in a flask. 2. Rotate the flask upside down. 3. Place ice onto the surface on top Explanation. The water was boiled first so that water vapour is released. Ice is placed on the surface so that condensation occurs. When it occurs, water vapour will transform into drops of water. Therefore, no more air(water vapour) is present, flask is partial vacuum. it means that the pressure in the flask decrease. When pressure decrease, the boiling point for a liquid will also decrease. So, water can be boiled in room temperature if the pressure is decreased. For our standard atmospheric pressure, the boiling point for water is 100 celcius.

Hot Water Cold Weather Experiment :What happens when you throw boiling hot water into -19 Celsius cold air? Apparently it turns into steam a disappears as is shown in this video.