Thermos Lab Report

Good Essays
Aim:
The aim of this practical experiment is to design, construct and test a container to insulate a cup of hot water, preventing and minimizing heat loss via the mechanisms of conduction, convection and radiation. The thermos design must be freestanding and effective against any means of heat loss to the surroundings. This data is then compared to a control, which is a cup of hot water in a polystyrene cup without any sort of insulation and protection against heat transfer to determine the effectiveness of the thermos in regards to heat loss via conduction, convection and radiation.
Background Physics:
Conduction: Transfer of heat through a substance as a result of collision between neighbouring vibrating particles, usually in solids, metals
…show more content…
8) Empty cups, cool temperature probes in cold water until it reaches room temperature.
9) Repeat steps 1-8 for second trial.
Our thermos was constructed with materials that minimizes energy loss by conduction, convection and radiation to the greatest degree. We created the thermos with multiple layers, starting with the two polystyrene cups in the centre, which were wrapped in bubble wrap and taped. A polystyrene lid was also cut out and placed on top of the inner polystyrene cup. Each layer of polystyrene and paper cups were wrapped in aluminium foil. We also, covered the outside and bottom of the thermos with polystyrene and aluminium foil. Finally, we covered the hole in which the heat probe was inserted with sticky tape. Throughout the construction of the thermos, we tried to imitate the mechanisms used in a commercial thermos to reduce heat
…show more content…
This is effective as polystyrene is an insulator and can block transfer of heat energy towards the surroundings. We also incorporated bubble wrap into our thermos design to try and imitate the effect of the double glass layer in a commercial thermoses. The air trapped in the bubble wrap is extremely effective in keeping heat inside and reducing heat loss as not only does the heat have to go through plastic (which is a very good insulator) but it also has to pass through a layer of air/vacuum. This prevents conduction from occurring throughout most of the thermos as conduction can only occur near the top of the thermos where the layers meet. The almost nonexistence spaces of air created by all the tightly bound layers results in almost no transfer of heat from the wall containing the hot water to the outer wall by convection. The polystyrene lid is also used in order to prevent heat loss via convection as hot air rises to the top, carrying energy with it. The aluminium foil in each layer, prevents heat loss by radiation as it reflects radiated heat back to the inside, the same way a space blanket

Related Documents

  • Decent Essays

    Place the test tube with cyclohexane into the apparatus. Insert thermometer and stirring wire in it. The thermometer should not touch the bottom of the large test tube. 4. Add ice and water into the large beaker.…

    • 1578 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    Flask Lab Report

    • 907 Words
    • 4 Pages

    Measure and record the exact temperature of the boiling water in the beaker, as well as the barometric pressure in the lab. 12. When the flask has cooled completely, carefully dry the outside of the flask to remove any water. Weigh the flask, foil cover, and vapor with as many sigfigs as possible. 13.…

    • 907 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    HCl. Keep the solution in ice water bath. Part II: Preparation of the diazonium ion Take 5.5 g of p-toluidine into a 100 mL conical flask and add 8 mL water and 6 mL Conc. HCl to it. Stir the solution and heat it until the solid dissolves.…

    • 2234 Words
    • 9 Pages
    Decent Essays
  • Decent Essays

    Camphene Synthesis

    • 1013 Words
    • 5 Pages

    A thermometer wire was placed in the water bath to monitor the temperature throughout the experiment. After the camphene dissolved, 0.50 mL of 8 M sulfuric acid (H2SO4) was added. To prepare for heating, a cork was placed upside down to cap the mixture and prevent evaporation. The mixture was then heated until the water bath reached 85 °C. The temperature was maintained…

    • 1013 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    Isobutylene Research Paper

    • 1817 Words
    • 8 Pages

    The outlet feed stream from V2215 A/ B is routed to the filters (F2203 A/ B) to ensure that the feed stream supplied to the cold box is clean from dust and moisture. Isobutane that leaves the filters enters the cold box to produce a fresh stream of Isobutylene (C4H8) and Hydrogen (H2) rich recycle gas as shown in Equation (4). Finally, C4H8 and H2 pass through Hot Combine Feed Exchanger (E2201 A/ B) to be heated up before entering the three reactors that are connected in parallel (R-2201, R-2202, R-2203); Whereas the isobutane is converted into isobutylene by using the catalyst inside the three reactors.The percentage of the Isobutane that converted to Isobutylene…

    • 1817 Words
    • 8 Pages
    Decent Essays
  • Decent Essays

    First of all, weigh 1.0 g of sample accurately in 250 mL digestion tubes by using analytical balance. After adding 1 tablet of Kjeltabs catalyst Cu 3.5 into the tube, add 12 mL of concentrated sulfuric acid, H2SO4 with caution, and shake the tube gently to moisten the sample with the appropriate acid. Connect the Exhaust system with the tubes which has been placed on the rack and ensure the aspirator system to start functioning. The rack and Exhaust system are locked to heaters block digester DS6 which has been preheated to 420 ̊C to begin the process of acid digestion. After about 5 minutes, turn off the aspirator system until acid fumes can be formed only in the top Exhaust system.…

    • 1632 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    A flask keep hot things hot or cold things cold because it does not allow heat by any three ways of heat can travel. Three ways heat can be transferred are conduction in solids, convection of fluids (either liquid or gases) and radiation through anything that allow radiation to pass. Thermal equilibrium is an important concept in thermodynamics. When two systems are in thermal equilibrium, there is no net heat transfer between them. This occurs when the systems are at the same temperature.…

    • 1112 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    Saltwater causes rusting because it is a very decent direct that and there are various electrolysis reactions, which makes corrosion to happen. The factor that slows down corrosion is Oil. Oil slows down corrosion because oxygen and molecule could only get through the oil layer; furthermore, oil keeps oxygen particles from crashing on the surface. Aim: The Aim of this Investigation is to achieve the chemical reaction of Oxygen and Iron. Hypothesis: Independent Variables Dependent Variables Controlled Variables • Iron wool ball – When it is dipped in various types of liquid it may react to the oxygen in the liquid and chemical changes happen eg: Colour change = rusting • Thermometer – predicting the temperature of the iron wool ball below the room temperature • No substances or variable be kept the same If the off chance that the Iron wool ball is plunged in various sorts of liquid then the thermometer is embedded into the focal point of the Iron wool ball when it is secured in a paper towel and the rubber band, the iron wool ball will react a specific way.…

    • 1697 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    Flask Synthesis Lab Report

    • 1450 Words
    • 6 Pages

    The crystals were rinsed. The funnel was lifted slightly to break the vacuum. The crystals were covered with about 1 mL ice-cold acetone. The vacuum was reapplied immediately after. The crystals were air-dried for a few minutes and transferred onto a tared piece of 9 centimeter filtered paper.…

    • 1450 Words
    • 6 Pages
    Decent Essays
  • Decent Essays

    Pyrex Failure Case Study

    • 1173 Words
    • 5 Pages

    The objective for this report is to explain all the failures that might occur while making Pyrex and what are the cure that will help to prevent all of the causes and failures. Corning Inc. introduced Pyrex cookware in the market. Later, Pyrex was expanded to make clear and opal ware objects. Pyrex has a unique property that is Lower thermal expansion. Pyrex cookware is mostly made of borosilicate but it was later replaced by soda lime glass because that has a strong mechanical strength.…

    • 1173 Words
    • 5 Pages
    Decent Essays