What is Boiling: Definition and 319 Discussions

Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere. At sea level the boiling
point of water is 100 °C or 212 °F but at higher altitudes it drops to correspond with decreasing atmospheric pressures.
Boiling water is used as a method of making it potable by killing microbes and viruses that may be present. The sensitivity of different micro-organisms to heat varies. But if water is held at 100 °C (212 °F) for one minute, most micro-organisms and viruses are inactivated. Ten minutes at a temperature of 70 °C (158 °F) is also sufficient for most bacteria.
Boiling water is also used in several cooking methods including boiling, steaming and poaching.

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  1. A

    Another boiling point question

    In the attachment, i think the answer is c). However c) has the same molecular weight as d) and they are both alcohols. Is it that c) is not symmetrical, thus more polar as compared to d) and which is why c) should have a higher boiling point due to the stronger intermolecular forces?
  2. A

    Boiling Point Q: Is Alcohol Higher Than Ammonia?

    I think the answer is e). I don't think it is ammonia because of the hydrogen bonding between nitrogen and hydrogen. This will result in a higher boiling point. This is the same with Hydrogen fluoride and water. However, the two organic molecules I'm not sure. I assume that since the alcohol is...
  3. T

    Recrystallization: Melting & Boiling Points

    does anyone know why it is important to have the melting point of a solute not be higher than the boiling point of the solvent during recrystallization? --having a little trouble rationalizing this.
  4. M

    What is the boiling point of Steel?

    I'have searched a lot but could not find boiling point for steel. Can you tell me what's the boiling point of steel? Also any link for a table which provides both melting and boiling points for commonly used metals would be greatly appreciated. Here is what I found so far: Melting Point: The...
  5. Monique

    Boiling Water in New Saucepan Causes Puzzling Smell

    I just bought a saucepan on sale (40% off closeout sale) to use for making tea.. but I just boiled water in it and now it smells like melted plastic in here :bugeye: could it be I bought a pan that cannot be used on a gas stove? I'm puzzled :rolleyes:
  6. H

    80 g of lead into 80 g of water boiling at 100 degrees

    If I were to put about 80 g of lead into 80 g of water boiling at 100 degrees, after about 5 minutes, would the lead attain approximately 100 degrees or would it be significanty less?
  7. K

    Boiling point and evapoaration

    i know that pure liquids boil at a termperature of 100 degress but what is the difference between evaporation and boiling
  8. A

    Is the assertion true and the reason false?

    Catalysts I have to state if the "assertion" is true or false and as well the "Reason" if it is true or false. However, i also have to note if the reason is the correct explanation of the "assertion" The "assertion": #1. Decreasing the atmospheric pressure on a pot of boiling water causes...
  9. P

    Calculating Boiling Point Elevation for a Solution with Dissociating Solutes

    Here's the question: What is the boiling point of a solution that contains 1.25 mol CaCl_2 in 1400g of water? Now, I know that I have to take into account the fact that CaCl_2 disassociates in water to form ions. I thought the effective molality here would be 3 * 1.75 m since there are...
  10. I

    Where Does Energy Go When Water Boils?

    hi! I wanted to know the answer for this question: Where is the energy going when the water is boiling? We are talking about thermal energy in my class. Also, If I would place a beaker of water on a hot plate in order for it to get hot and change temperature, Would the hot plate transfer energy...
  11. C

    Melting & Boiling: Heat Energy Explained

    Boiling/ Melting... I take it everyone knows the graph of temperature when you heat ice / water - with the flat bits when it melts and boils. My question is why is this the case? Obviously the heat energy you are putting in is going to kinetic energy of the particles when the graph is not flat...
  12. J

    Sudden boiling of coffee in cup after heat source removed

    I just now heated a cup of coffee in a microwave oven for 2 minutes. When I opened the oven door to get the cup, the surface of the coffee was placid. But the moment I picked up the cup and moved it, there was a brief moment of boiling lasting maybe one second. What might have caused the...
  13. S

    Thermodynamics? Boiling point of NH3

    Thermodynamics?? Boiling point of NH3 I hope I'm in the right place here, I'm no scientist, just a guy with a question. How can I find out the boiling point of ammonia at various pressures. :confused: I am dealing with an ammonia refrigeration system and trying to figure out where the ammonia...
  14. B

    What are the factors that determine the boiling points of different substances?

    How do i find out which substance has a higher boiling point. Which substance has the higher boiling point? Explain. a.) LiCl or HCl b.) NH3 or PH3 c.) Xe or I2 I also have a question on vaporization Which forces oppose vaporization of each substance? a.) hexane b.) water c.) SiCl4
  15. C

    Determine the change in internal energy of boiling water

    Determine the change in internal energy of 1 kg of water at 100 degrees C when it is fully boiled. Once boiled this volume of water changes to 1671 Liters of steam at 100 degrees C Assume the pressure remains constantat 1 atm things i know 1 L =1E-3 m3 1atm = 1.013E5 N/m2 1 L = 1000 cm3 =...
  16. F

    Boiling Temperature & Heat of Vaporization: Explained

    Me again... Is it possible to find th etemperature of the steam if the water boils at 96 degrees Celsius? How? Another one, the boiling temperature of a liquid vaires with atmospheric pressure. Does the heat of vaporization vary with the boiling temperature of a liquid? Can someone...
  17. A

    Cooking Noodles with Boiling Water & Salt

    Hi all, there's so many forums here, I really don't know if this is the right one. However... Today, I cooked some noodles. The water was boiling low, just simmering. I had a taste, and decided the noodles needed more salt. So I added some salt. And, can you believe, where I put in the...
  18. M

    Boiling point vs. freezing point

    this is going to sound like an odd question, but which element has its boiling point and its freezing point closest together? by which i mean, which transitions through the phases the fastest?
  19. K

    Which Boiling Point is Higher: Hex+Prop vs Prop? URGENT!

    Boiling point, urgent ! Which of the following has higher boiling point? 1) Mixture of hexane and propanone 2) propapone (consider their relative molecular mass and the forces of attraction between the molecules) I think the mixture of hexane and propanone has a higher boiling point, as...
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