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The rate of heat loss from a beaker

Forms of heat loss: Radiation This is the loss of energy, in this case heat energy, through the atmosphere via electromagnetic waves. This gives it the ability to travel through a vacuum, i. When this energy reaches an object it is absorbed by it. The energy absorbed causes particles in the object to vibrate, and so it heats up.

The rate of heat loss from a beaker

The hotter an object is, the more energy it has and therefore more radiation will occur. Also the larger the surface area of an object, the more energy it will radiate. Dull coloured objects radiate more energy than shiny objects.

Convection Convection is the expansion of particles when they are heated.

  1. I believe that conduction will be second most deadly to heat loss, as heat will escape through the sides of the beaker and then escape out of the gaps of the large beaker or again through the sides.
  2. A similar statement can be made for heat being conducted through a layer of cellulose insulation in the wall of a home.
  3. More heat will be lost from a home through a larger window than through a smaller window of the same composition and thickness.
  4. Those of us who live in colder winter climates know this principle quite well. Evaporative Heat Loss Results and Calcualtions Discussion and Conclusion There are quite a number of things that might come up in discussion here, for example.
  5. Specific heat of sand versus water explain how the specific heat of a substance describes the rate of cooling and heating of that beaker, glass, 500-ml balance 1 per class test tube, glass, 18-mm 150-mm water, 750 ml.

When a water is heated, the particles within the substance expand and become less dense that normal. Due to this decrease in density the particles rise through the substance, and at the surface of the water some of the particles evaporate. As more water evaporates, more and more energy is lost and so the water cools down and when evaporation occurs the object that the substance is evaporating off cools.

  1. Forms of heat loss.
  2. The thermal conductivity of the same area will be decreased to 0.
  3. Thus, it will take more time to lose the heat energy from all the molecules.
  4. The variables are the temperature difference between the two locations, the material present between the two locations, the area through which the heat will be transferred, and the distance it must be transferred.

This is shown well when you get out the shower and you feel cold because the water is evaporating off of you. When the particles move away from the heat source or are so expanded that the particles are not passing heat from one to another, the particles cool.

Rates of Heat Transfer

When they cool they compress back to their original density, which causes them to fall to the bottom of the water. As they are now tightly packed they heat is conducted from one particle to another and they heat, expand, rise, cool and so on as the cycle continues.

  • Measure the mass and temperature of the water every 2 minutes for the next 10 minutes;
  • Why does a small beaker cool faster than a quite obviously the larger beaker has more heat energy within it than the small one-assuming the temperatures were the same at the start the more the enrgy absorbed heat loss during colling varries the same ie less heat energy;
  • For instance, heat transfer through windows of homes is dependent upon the size of the window;
  • Furthermore, coatings are placed on the windows to improve efficiency;
  • This is shown well when you get out the shower and you feel cold because the water is evaporating off of you;
  • As more water evaporates, more and more energy is lost and so the water cools down and when evaporation occurs the object that the substance is evaporating off cools.

This cycle is called convection current. Conduction Conduction can take place in solids, liquids and gases.

Investigating factors which affect heat loss from a beaker of hot water

When a material is heated the particles nearest to the heat gain kinetic energy. They then start to vibrate faster due to this energy and as they do they touch other particles and transfer the kinetic energy to them.

Factors affecting the rate of Heat loss in a Liquid Lab Answers

This process is repeated and the energy is transferred through out the object from hot regions to cooler regions.

As the water looses heat from the sides of the beaker, conduction will cool the mass of the water. Conduction will also occur through the sides of the beaker and then radiate and through the base. These results were used as a control. Prediction I predict that heat will be mostly lost through convection.

Investigating factors which affect heat loss from a beaker of hot water.

This is because as hot water rises to the top it will evaporate and therefore heat will be given off. I believe that conduction will be second most deadly to heat loss, as heat will escape through the sides of the beaker and then escape out of the gaps of the large beaker or again through the sides. Radiation will be the least effective to heat loss, as foil will be wrapped around the beaker. This is because dull objects radiate more energy than shiny.

  • This cycle is called convection current;;
  • I believe that conduction will be second most deadly to heat loss, as heat will escape through the sides of the beaker and then escape out of the gaps of the large beaker or again through the sides;
  • Lesson 1 of this Thermal Physics chapter has focused on the meaning of temperature and heat;
  • Rate of cooling and surface area to surface to area to volume ratio is the same for all beakers and all beakers lose heat at the same rate 50ml beaker loses heat fastest because it has the smallest volume so less heat to lose from the start other reason for heat loss besides the;
  • According to the graph, the lower volume of water 50 ml has a greater fall in temperature, and so, the graph decreases rapidly;
  • The energy absorbed causes particles in the object to vibrate, and so it heats up.

I think heat loss will be most effective when no foil is wrapped around the large beaker and when there is no insulation between it because then conduction and convection take their role therefore losing the most heat. Whereas I think heat loss will be least effective when there is foil wrapped around the large beaker and when there is insulation in-between. This is because convection is the only form of heat loss that can take place without struggle therefore losing the least heat.

Obtaining Evidence The following factors will be considered when providing a fair test: