Stan Wagon Department of Mathematics and Computer Science Macalester College St. Paul, MN 55105 wagon@macalester.edu Robert Portmann 325 Broadway Boulder, CO 80305 1. Water boils at 100ºC (212ºF) at sea level, but at my city it boils at approximately 91.2ºC (196.1ºF)! Brew the leaves for two to three minutes. Who is the longest reigning WWE Champion of all time? The equation for converting that to h, is a pain, but assuming we have air on the outside, and water on the inside. As they are synthetic they cannot be exposed to temps above 85 degrees. Ask a science question, get a science answer. How long does it take for boiling water to cool down to 80 degrees? Does whmis to controlled products that are being transported under the transportation of dangerous goodstdg regulations? But as long as you don't let the water get to cool than it's fine. I don't have a thermometer? How much money do you start with in monopoly revolution? Favorite Answer. A few (like catnip and yerba mate) should not be steeped in water that is fully boiling. Conditions: I live at sea level, I've just boiled the kettle to the point it has automatically switched off declaring the contents boiled, the room is at an utterly normal temp., I've started the stopwatch. Where A is the surface area of the object, and h is the heat transfer coefficient. I'm saying your Kettle is a cylinder with no top or bottom 0.2m high and 0.15m in diameter, so it's area is: Okay, my coefficients must be out, because according to that, in about 100 seconds (5 times 1/0.05), your water is at room temperature, which isn't right. In case someone needs to know, the 60-80ml of water will be in a ceramic bowl and the 200-220ml of water … Metals are very conductive to heat, so have a high h, while plastics are less conductive, and hence have a small h. h is also inverse proportional the thickness, because a thick container doesn't loose heat as fast as a small one. My kettle traps heat like no other, if I left it as is and used it, even after 30 minutes it would be boiling hot (which I did for 3 months!!) 1 minute, 2 minutes, 2 minutes and 30 seconds, 10 minutes? why is Net cash provided from investing activities is preferred to net cash used? This water is around 200 - 205 degrees. So the question is, can I guesstimate h and A for your kettle. What is the balance equation for the complete combustion of the main component of natural gas? Copyright © 2021 Multiply Media, LLC. However, generally speaking, water at a full boil (212 F) will work. if you mean a mouthpiece yes, dip in boiling water for 35 sec. Answer Save. After a while I got really good at judging just by the sound and steam level from the kettle. For example, if I boil water in a tea kettle, how long would it take to reach 180 degrees after I take it off the heat? Regarding the question, if there is absolutely no convection, then, as a worst case, you would have a straight diffusion problem. (all degrees in fahrenheit) 165 170 180 200 All measurements should be done in a 47oz kettle. I know this sounds a bit weird but I heard I can curl my synthetic hair if I put them in rollers and dip them in hot water. Hi, I don't have a thermometer and honestly curiosity is consuming me. In general, temperature follows a really nice equation: dT/dt means "the rate at which the temperature changes over time" T is the temperature of the water in the kettle, Ta is the temperature of the room. then dip in cool water not ice water for 3 sec. Adapted from Serious Eats. Thirty minutes is a long time! Others (like fennel seed) should be boiled to release their full flavor. $\begingroup$ I haven't checked your arithmetic, but your approach is correct. 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