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Why does your hand feel cold when you drop methylated spirit on it?
methylated spirit is in fact methanol added to ethanol (usually 10% methanol is used). The liquid evaporates which means that the liquid converts to a gaseous state. This process requires energy which it extracts from your body in the form of heat. This same process cools you down when you sweat. The reason that spirits feel colder than say room temperature water is that the boiling point of alcohol is much lower than water(about 78 degrees C for ethanol and 100 degrees C for water). This means that at room temperature the partial pressure of ethanol is higher which means more of it is evaporating from your skin than water, requiring more energy(which makes your hand feel cold).
What is the state of krypton at 100 degrees?
At 100 degrees Celsius, krypton is in a gaseous state. Krypton is a noble gas with a boiling point of -157.4 degrees Celsius, so at 100 degrees Celsius, it remains well above its boiling point and exists as a colorless, odorless gas. It does not condense into a liquid until temperatures drop significantly below its boiling point.
What would happen to the boiling point of a substance if the elevation were to rise?
Actually, as you rise in elevation in atmoshpere im assuming, the pressure decreases. This pressure drop will cause the boiling point of anything to rise, therefore requiring more energy to boil.
What can be done to raise the boiling point of water?
All you have to do to reduce the boiling point of water is go to a higher altitude and boil it.
Why can't water excede it's boiling point?
Who told you that water can not exceed its boiling point? It happens every day! Every day someone heats a cup of water in the microwave. It reaches around 110 C or 230F. Then when they drop a teaspoon full of instant coffee into the cup, it boils all over the place. The superheated water is dropping down to its boiling point. Water can exceed its boiling point. Water can also exceed its boiling point in an enclosed pressurized container. One such machine was called "The steam locomotive." One item used on the cook stove was called "The Pressure Cooker." These heated water above the boiling point. However, under standard conditions, when water begins to boil its vapor pressure will equal the air pressure. Any attempt to make the water hotter would increase its vapor pressure. When water gives off vapor, that cools down the temperature of the water. So the air pressure determines boiling point.
What is Initial boiling point?
The initial boiling point is the temperature whereby the first drop of distillate has appeared.
Why does your hand feel cold when you drop methylated spirit on it?
methylated spirit is in fact methanol added to ethanol (usually 10% methanol is used). The liquid evaporates which means that the liquid converts to a gaseous state. This process requires energy which it extracts from your body in the form of heat. This same process cools you down when you sweat. The reason that spirits feel colder than say room temperature water is that the boiling point of alcohol is much lower than water(about 78 degrees C for ethanol and 100 degrees C for water). This means that at room temperature the partial pressure of ethanol is higher which means more of it is evaporating from your skin than water, requiring more energy(which makes your hand feel cold).
What is initial point?
The initial boiling point is the temperature whereby the first drop of distillate has appeared.
How many degrees does 936F have to drop before it reaches boiling point?
724 degrees.
Does raising the elevation of a bowl of water lower the boiling point for that water?
As the air pressure drops the boiling point of water (or any substance) will also drop. The higher your altitude the lower the air pressure.
Would extra coolant in the radiator help to keep the temperature cooler?
No, It would only raise the boiling point higher and drop the freezing point lower.
What is the state of krypton at 100 degrees?
At 100 degrees Celsius, krypton is in a gaseous state. Krypton is a noble gas with a boiling point of -157.4 degrees Celsius, so at 100 degrees Celsius, it remains well above its boiling point and exists as a colorless, odorless gas. It does not condense into a liquid until temperatures drop significantly below its boiling point.
What is super heat sub cooling?
The compressor elevates the boiling point of the refrigerant to a point at which the air (or water) moves across the condenser is low enough to condense the refrigerant to a liquid. Additional passes in the condenser coil cool the liquid refrigerant below its boiling point to ensure it remains a liquid as it experiences pressure drop in its journey to the evaporator. This cooling below the boiling point is called sub cooling
What is dependency of pressure and boiling point?
As air pressure drops over the water surface the boiling point will drop and vice versa. So a kettle of water will boil at a lower temperature at the top of a mountain than at sea level because there's lower air or atmospheric pressure at the mountain top. Pressure is proportional to boiling point
When would there be a temperature drop in the middle not near the end of fractional distillation What does it signify?
A temperature drop in the middle and not near the end of fractional distillation just means that you distilled the substance you wanted more rapidly than expected. It also means that your original mixture had a higher amount of the other substance than expected.
What would happen to the boiling point of a substance if the elevation were to rise?
Actually, as you rise in elevation in atmoshpere im assuming, the pressure decreases. This pressure drop will cause the boiling point of anything to rise, therefore requiring more energy to boil.
What can be done to raise the boiling point of water?
All you have to do to reduce the boiling point of water is go to a higher altitude and boil it.
