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Investigate if heat is lost through convection quicker then evaporation.

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Introduction

Paula Wilkes 10JW Plan Aim Investigate if heat is lost through convection quicker then evaporation. Apparatus: Beakers, water (150ml), Thermometer, stand and clamp, red material, scissors and timer. Key factors I need to keep the size of the beaker, water (150ml), temperature and insulating material. I need to Change where I put the insulating material on the beaker. I need to measure the water (150ml). To make this experiment a fair test I will have to keep the following factors the same: * Volume of water * Starting temperature of water * The number of times the insulation is wrapped around the container * Material of container * Where the thermometer is placed in the water * Be careful to protect eyes by using safety goggles If I keep all of these the same my experiment will be a fair one. Method 1. Put on safety goggles 2. ...read more.

Middle

Convection is where the cooler water particles sink down to the bottom and the warmer water particles float up to the top. If there is no lid on the beaker the warm water will float up to the top and the heat energy will escape out of the top. If a pan of water was being heated from below then the water particles at the bottom of the pan will become warm as therefore become less dense, they will begin to rise to the top of the pan. As the warmer water particles begin to rise, the cooler water particles at the top of the pan will sink to the bottom, as they are less dense. Once at the bottom of the pan, the water will start to get warmer and become less dense. This process will continue until the pan of water is at the same temperature. Conduction is when heat energy passes through the walls of the beaker by making the particles of the beaker vibrate and ...read more.

Conclusion

I measured the water with a measuring cylinder as the water meniscus just touched the line. I also measured the temperature with a thermometer to the nearest .5 �C. I measured the starting temperature accurately. I measured the time every minute to the nearest second with the stop clock. I did take enough readings as I recorded the temperature once every minute for 20 minutes, which gave me 20 results I obtained an anomalous result. This result may have been in error because I may have recorded the time at slightly different times when writing down the temperature or I miss read the temperature. To improve my experiment I would take the readings twice to make an average. Conclusion I concluded that the heat lost was greater by convection and evaporation than by conduction. When the flask was covered and heat could only escape through the sides it took longer to cool as the resistance to heat lose through a conductor was greater than heat lose by convection and evaporation. This was proved by the experiment and shows on the graph. ...read more.

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