To see how long it takes the size of a hot object to cool down.

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Sukhdeep Singh Kairo

SIZE & COOLING

Aim: To see how long it takes the size of a hot object to cool down.

Planning: I will make sure I devise a fair test by doing things correctly and fairly. The only variable I will be obtaining will be the temperature of the water at 80oc, and I will make sure it is fair by testing it with a thermometer. I will also make sure it is a fair test by adding more water into the bigger beakers because it wont all fit into the smaller ones so that will give the smaller beakers a fair chance as well, and I will measure the water in a measuring cylinder to make it fair. I will also make sure I devise a fair test by using a stopwatch to record the result every 30 seconds up to 2minutes, because it is more reliable and accurate. I will make sure it is fair when we record the results because when we get the temperature I will get a second opinion of my friend. I will also make sure my experiment is safe in all the possible ways I can. I will make sure we are safe by wearing rubber gloves just in case we spill some boiling water on our hands.

Prediction: I predict that the bigger the beaker the faster it will cool, and the smaller the beaker the longer it will take to cool. I know this because of the “Food Theory”, the theory tells me that if there was a plate with a pile of hot food on it, it will take quite long for it to cool down, where as if you were to break that pile of hot food into smaller pieces of food then it will cool down much quicker because when you break it up you are giving it a bigger surface area so heat can escape around the sides, top and bottom. So therefore I think the same will happen with the beakers, but the bigger the beaker is obviously going to have a bigger surface area than the smaller beakers, where as in the theory the smaller food pieces have a bigger surface area than the pile of food, but that is because you cant break the beakers into pieces.

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Apparatus: 

  • 4 different sized beakers
  • Water at 80oc
  • Kettle
  • Thermometer
  • Rubber Gloves
  • Stop watch
  • Pen & Paper (for results)

Method: First of all I got the equipment, which consists of 4 different sized beakers, a thermometer, a kettle, measuring cylinder and some water. Then I put the kettle on, when the water was boiled up to 80oc I measured it in the measuring cylinder and put the correct amount of water into the correct beaker, then we waited and every 30 seconds on the stop watch, we then measured the temperature of the water in the ...

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