Introduction:Conductionis heat transferred through a medium which its particles do not move forexample when you light a fire under a spoon and when you touch the handle ofthe spoon it will be hot.
Convection is transferred through a medium in whichits particles travels in fluids (gas). This is a thermal heat experiment thatrequires hot and cold water. We use two containers of water, which areidentical in shape and also it has an identical amount of water. The onlydifference between the two is that the water in one is at a higher temperaturethan the water in the other one. If the hot water started at 99.
9° C, and thecold water started at 0.01° C, then it is clear that the original cooler waterwould have frozen first. However, under some conditions the original warmerwater will freeze first. If that happens, you have seen the Mpemba effect whichdescribes that phenomenon. Mpemba effect is a theory that the hotter waterfreezes faster than cold water but it does not always happened, cold wateroften freezes first rather than the hot water.
Research Question:Howdoes the temperature of water affect their freezing time? Hypothesis:Coldwater will freeze faster than hot water because hot water needs longer time tocool down. This is because the particles in hot water are moving faster thanparticles in cold water, so it takes longer time for the particles in the hotwater to slow down than the cold water. A liquid can freeze when all of theirparticles are moving really slow, so the hot water will freeze slower. Variables:IndependentVariable:5different temperatures of water (10?C, 30?C, 50?C, 70?C, 90?C). DependentVariable:Thetime taken for each water to freeze, measured in minutes. ControlVariable: Mass of each type of water The volume of each type of water The final temperature of both type of water The temperature of the environment (AC Temperature) The material of the container Same freezer Same Thermometer Same pan Same timer Apparatus: 5x 500ml beaker 500ml of 10?C water 500ml of 30?C water 500ml of 50?C water 500ml of 70?C water 500ml of 90?C water 1x timer 1x freezer 5x camera Thermometer Pan (for boiling) Method: Heat each 500 ml of water to the intended temperature Pour each of them to each beaker Put on at a time and each camera to record on at a time into the freezer Record the time for the water to freeze using the timer Record the time needed by each type of water to freeze Repeat step number 3 to 5 Safety Guideline: Be careful when heating the water, so that you will not get hurt.
Wear lab coat and gloves if you really need it. Dont’t hold the pan because it is hot Be careful when you lift the boiling water make sure you are balanced. If you are not used to boil water, you should ask adults for help. WorksCited”Does Hot Water Freeze Fasterthan Cold Water?” Information about Does Hot Water Freeze Faster than ColdWater? with Fizzics Education | Kids Science Experiments,www.fizzicseducation.com.au/Free+experiments/Kitchen+chemistry/Does+hot+water+freeze+faster+than+cold+water.html.
MacDonald, Fiona. “Does HotWater Really Freeze Faster Than Cold Water?” ScienceAlert,www.sciencealert.
com/does-hot-water-really-freeze-faster-than-cold-water.”Mpemba Effect: Why Hot WaterCan Freeze Faster than Cold.” Phys.org – News and Articles on Science andTechnology, phys.org/news/2010-03-mpemba-effect-hot-faster-cold.html.