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    Which boils faster: hot water or cold? We have the answer


    The Chatelaine Kitchen is a very dynamic place. On any given day it is as much a laboratory and reference library as it is a kitchen. Our work often reveals answers to some common kitchen misconceptions. So, I thought we should share some of our recent and useful findings with you.

    Green onions vs. scallions
    You say scallion, I say green onion, but are they the same? My conclusion is yes. If you consult a typical seed catalogue you will not find a listing for either green onions or scallions. Instead both are classified as "bunching onions," which is a variety of onion that can be eaten in an immature state. So, what is often referred to as a "green onion" refers to young "bunching onions" that have a bulb at the bottom - even just a slight bulb. Scallions have the same characteristics however are more slender and lack the round bulb. This suggests that scallions are simply green onions picked earlier, before a bulb forms. The Chatelaine Kitchen uses the term "green onion", which are particularly delicious in our Asian Flatbread.

    A spatula is a spatula is a spatula: Do you scrape a bowl with a spatula? Do you flip your pancakes with a spatula? Which is it? At risk of revealing my bias, I have personally never flipped anything with a spatula. But in fairness to those who feel they have, this required further investigation. Terms often used to describe spatula include: flat; flexible; and broad. Its uses include: mixing; scraping; spreading; and lifting. In all my research I could not find a case where its listed uses included flipping.  In the case of off-set spatulas, while they are often used as flippers, their actual purpose is to lift and spread. Granted the word spatula has become a catch-all phrase for many kitchen tools, let it stand that a spatula will help you mix your cake batter, scrape it into the pan, spread the icing on top and lift a slice of cake to serve - but it should not flip a pancake!

    The fastest way to bring a pot of water to a boil
    Many have claimed that a pot of water will come to a boil faster if you start with cold water. This claim, both perplexing and intriguing, required further investigation. In turn, I performed five tests using the same pot and the same burner to see how long it would take for 2 cups of tap water to come to a boil. Here are my results:       

    • 2 cups cold water: 4 ½ min
    • 2 cups hot water: 3 ½ min
    • 2 cups cold water lid on: 3 ¾ min
    • 2 cups hot water lid on: 3 min

    So having concluded that the fastest way to boil water seems to be to use hot water with the lid on I decided to tackle one more claim: that adding salt will speed up the boiling process.

    I added ½ tsp salt to 2 cups hot water over high heat with the lid on. My result was 3 ¼ mins, so 15 seconds slower than without the salt. Adding salt actually increases the boiling point, therefore taking longer to boil. The Chatelaine Kitchen omits salt from the boiling process for our pasta recipes, saving you the sodium levels, as well as a few seconds every day.
    Try it: Creamy spinach and artichoke baked pasta (Sept 2011). Mediterranean linguine with shrimp and feta (Nov. 2011)

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    • Happy camper  •  Boston, United States  •  2 months ago
      Hot water boils quicker as it is part-way heated, cold water will go through a larger change in temperature in the same time frame....this is why people confuse this. There is a similar arguement about which freezes quicker. Again, cold water is part way there and will freeze quicker, but hot water goes through a more rapid change over the same time frame, but it will NOT freeze quicker. == college analytical chemistry!!
    • Canadian  •  Calgary, Alberta  •  4 months ago
      No question...hot water will boil faster...anyone with a high school chemistry education will tell you that...but...
      Water from your hot water tank should not be drank on a regular basis...the magnesium rod, which prevents your tank from corroding put an excessive amount of magnesium in the water...water from your tap does not have that...so if you want to boil water faster, get an instant hot water accessory in your kitchen.
      • porkinthepines 4 months ago
        ridiculous
      • Susan 4 months ago
        only thing i disagree with is that you need high school chemistry to figure out that hot water would boil faster than cold - makes you wonder what kind of people are writing these articles, as i always knew to boil cold instead of hot, NOT because cold would boil faster (really i have a hard time believing that is what most people think???) but exactly as you say, the water in the hot water tank is less pure
      • M 4 months ago
        Susan, I was reading the article thinking the same thing - I'm at least comforted to know that most of the people reading this article are more clued in than the author apparently is re: reasons to use cold water for boiling water.
    • Artisticallyderanged  •  4 months ago
      What kind of butter spreads quicker, liquid or solid? I am freaking out here, please write an article about this as quickly as possible!
      • DTCB 4 months ago
        just use the spray on butter
      • beartalon 4 months ago
        Liquid butter shouldn't need to be spread. Liquids are already "spread". Soft butter spreads more quickly thank hard because it's easier to manipulate in it's semi-solid state.
    • FRANK  •  Kitchener, Ontario  •  4 months ago
      you should probably not be drinking water from a hot water tap, and if you have seen the bottom of an old hotwater tank, you'll know why.
      • Jimjimny 4 months ago
        They do teach food hygine in Ontario then.
        Is this the main reason to buy and use a dishwasher for all pots and pans.
      • iamspuzzum 4 months ago
        Difference is, you're not drinking the water from the dishwasher.. and the detergent usually has bleach or some other disinfectant.
      • Chris 4 months ago
        you do realise all that crud in the bottom of the tank is from the domestic water coming into your house anyways? at least in the hot water tank it has time to sift out.
    • ur wrong  •  Victoria, British Columbia  •  4 months ago
      I bring his up to the forum because i think it's ridiculous. my wife says her tea tastes better when she adds milk first, then her tea... she won't drink it if the tea goes in and then the milk. I call BS
      • Jay 4 months ago
        Maybe adding the tea slowly to the milk will not burn the milk proteins? Probably very little difference in taste and more of a custom passed on to her from her family
      • David 4 months ago
        Just another obsesive compulsive brain at it's best.
      • Wearezeros 4 months ago
        Yeah, it does change the taste, but not very much. I know people that won't drink tea if the milk is added to the tea. Gotta love the British.
    • Cud be me  •  4 months ago
      Really???????????? Water that is already closer to the boiling point will get there faster than water that is nearer the freezing point????????????? Who new????

      Thank you yahoo for explaining that for me, I WOULD NEVER HAD KNOWN THAT!!!!

      Maybe next you can ask if a car that has 250 hp will get to 100 kmh than a car that has 125 hp. Maybe your readers would like to know the answer to that question too.

      The editors of this website are IDIOTS. Why don't you please post articles that have some bearing on the life we live. Like world news etc..............Oh but that would take to much intelligence on your part which it seems there is a lack of every time I look at this site.
      • D C 4 months ago
        Yeah , no kidding . Next time they're going to tell us that taking a plane gets you faster to where you want to go , than driving there .... Thank God we are lucky enough to have these people around , to smarten us up . Yuckkk
      • Cud be me 4 months ago
        Your right DC! Hey go check out the job they do of linking an X factor article to one about brain power.....................they have a bad brain synapse some where.

        IDIOTS............................I love saying that about yahoo. :)
      • In-yer -face 4 months ago
        and yet we keep getting sucked back in to read these mindless articles....so i ask myself why??
    • Steve  •  Winnipeg, Manitoba  •  4 months ago
      but which freezes faster, cold or hot water
    • josuhua p  •  Ajax, Ontario  •  4 months ago
      You know the world is starting to go down the crapper when boiling water becomes news....
    • Nicole N  •  Calgary, Alberta  •  4 months ago
      That's like saying hot water will freeze faster then cold water. DUH.
    • d  •  4 months ago
      oh. my. god. are we this stupid? of course hot water boils faster than cold water!!! basic physics!!! hot water requires less additional heat energy to reach the boiling point.

      and of course adding salt slows the boiling speed!!! the presence of salt raises the temperature needed to be reached before water can boil.

      let me guess the next question.... what's longer, a 5 mile road or a 10 mile road? can't wait to hear the results of the 'experiment.'
    • Andrew  •  Vancouver, British Columbia  •  4 months ago
      Worst article ever
    • post-it man  •  Toronto, Ontario  •  4 months ago
      every time I hear an old wives tale like this I want to punch someone in the face.

      I never realized how truly STOOOOPID the average blogger is until I started looking at these comment sections.

      here's an idea, put the same about of water in separate pots on the same heat source except on pot is 1 degree above freezing and the other is 1 degree below boiling.

      Q: which one starts to boil first? (hint: if you claim the cold water boils first, you need to check in to the nearest psychiatric facility.)
    • Kagees  •  Fort Lauderdale, United States  •  4 months ago
      Every time I get in "hot water" my wife come to a boil really fast.
    • John Rambo  •  Saguenay, Quebec  •  4 months ago
      For the salt part, since it makes the ebulition point higher, they should have tried to cook pasta to see if total process was shorter, not just the boiling part.
    • J Hoffa  •  4 months ago
      Uh... well... um... starting with hot water means the burner doesn't have as much work to do so... um.. ya. What a discovery.
    • Marcos  •  Toronto, Ontario  •  4 months ago
      You need 1 BTU of heat energy to raise a pound of water one degree Farenheit. Then it takes 973 BTUs of latent heat energy to take each pound of water from 212 degrees Farenheit to steam that is 212 degrees Farenheit. The colder the water is before you add heat to it, the more BTUs of heat energy you will need to bring it to a boil and the longer it takes. Simple stuff. A more fun (funner?) article would have been why a cup of hot water turns directly into snow when you throw it up in the air on a really cold day instead of a cup of cold water. Or, maybe an article about Charles' Law showing what atmospheric pressure would have to be for water to boil at room temperature. I think that would be a more memorable subject. :)
    • ed s  •  Montreal, Quebec  •  4 months ago
      always use cold water for drinking and cooking. the hot water heater, whether it's the usual large tank kind, or a new instant-heat gas kind, gradually accumulates a buildup of lime, iron and other chemicals, even some high temperature-tolerant bacteria (since the water in the hot water tank never gets hotter than about 50C degrees). That stuff in the tank is not healthy for drinking. hot water from the tank is only good for washing.
    • Chris  •  Kingston, Ontario  •  4 months ago
      Are you frickin' kidding me!!!
    • Sara  •  4 months ago
      wow.... they think that we're stupid or something? Of course hot water is gunna boil faster!!
    • Citizen 827  •  Toronto, Ontario  •  4 months ago
      I'm a chef. The proper term for a flipper is an "Offset Spatula" the proper term for the cake bowl scraper is simply "Spatula."

      Adding salt to water does increase the speed at which the water boils, it lowers the boiling point. So the water would boil at 99 or 98 not 100. However it takes the same amount of time to agitate the water molecules.

      We dont put salt in water to speed boiling. We put salt in water to add salty flavor to the pasta we cook in the water.

      transversely we put salt on the sidewalk in the winter to melt the ice because the salt raises the freezing temperature. it sort of takes the peak off the temperature controlled physcal states of water molecules.

      The only way to speed the boiling process is to add or remove pressure.You can boil water in a vaccuum tube by remiving the air from the tube and you use no heat! (grade 10 Science thanks Mr. Harris.)

      Can I get a job writing articles for Chatelaine please? I am a Cordon Beu trained Red Seal Jorneyman Chef, I am used to working with tight dealdines, I can spell, and I know the basics of how to boil a pot of water, I know all the general kitchen terminolgy used to describe basic kitchen utensils without conducting serveys or having to ask people.
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