Investigating The Coefficient Of Thermal Conductivity For Copper And Stainless Steel

Why Whales Lost Their Legs Kiara Rojas Honors Biology INTRODUCTION Millions of years ago, whales had legs. Pakicetus, the first whales, were land animals. Pakicetus does not resemble the whale at all from the outside but, they share a similar ear region that is unlike those of any other mammal. This discovery provided evidence that Pakicetus and whales are linked. The question is, why did whale lose their legs?

Place the beaker on the hot plate, place the thermometer in the beaker and set the hot plate to 5oC.

If I were to do the experiment again, we should first try to mix the water in the beaker so that the temperature of the water inside the beaker would be equal, if I didn’t mix it, the hot water would stay at the top and the cold would sink down to the bottom, we should at least mix the water for 15 seconds to get a more accurate temperature of the water.

The purpose of this experiment is to identify unknown substances by finding certain properties that this substance has. Like the density,melting point and the boiling point with these we are able to identify the unknown liquid and unknown solid that we are given. In order to get the density of a liquid we are first going to divide the mass of the liquid by the volume of the liquid in order to get us the density. In order to get the density of a solid we are going to divide the mass of the solid by the volume of the solid in order to get us the density of the solid. Next we are going to want to find the boiling point of a liquid we find this by placing a thermometer and test tube into a beaker with some water in it. Then we boil it and record the data we are going to want to record the start of the boiling and constant temp of the boiling then use this equation ( Start of boiling + constant temp of boiling ) / 2. This will give us our boiling temperature +/- 5 degrees. Finally we are going to want to find the melting point of a solid we do this by placing the tube in the device that determines the melting point of a solid. Then we

* Use thermometer to measure the temperature of the water in the beaker using Celsius unit. Record measurement in Data Below.

The second experiment involved the heat exchange between metal and water. The metal in beaker and water in calorimeter

What I learned from this lab is that when you put metal in hot water it does not go up alot the Initial temperature was 23.8 degrees and once we put in the metal it was finished we took the temp and saw the final was 23.9 degrees. That did not go up pretty much it went up like .1 degrees.

In an article called “Heat Transfer by conduction” by Mike Brown, it states “Thermal energy in the vibrating particles or molecules is passed on to nearby particles in a process called conduction”. This explains to us the process of conduction in which it relates to our design because when we insert the thermometer into the warm water, our goal is to keep the water warm with our cup so that once the thermometer makes DIRECT contact with the warm water, it will heat up the thermometer and give us an exact temperature.

In this experiment, a scientist will test which of three metals copper, steel, or brass produces the most thermal energy. The independent variables are the three metals used and the time amount of time the metals spent in water. The dependent variable is the thermal energy conducted. The control for this experiment would be a nonconductive material and the constant materials are the pot, stove and Styrofoam cups used. The data will all be calculated in degrees Fahrenheit.

Heat energy (or just heat) is a form of energy which transfers among particles in a substance (or system) by means of kinetic energy of those particles. Heat energy can be transferred by four different methods such as conduction, radiation, convection, and latent heat transfer. In conduction, the heat spreads through a substance when faster atoms and molecules collide with neighboring slower ones and it transfers some of their kinetic energy to them. A great example of conduction is when you can warm your back muscles with a heating pad. Radiation is the process where heat emanates from an object that

After a further analysis of the results it has been seen that the averages of the results have proven the hypothesis to be correct. Hence the constructed calorimeter has been more efficient in reducing the enthalpy number upon burning ethanol compared to the copper calorimeters that have been previously used. Its has become known that due to more heat being absorbed the enthalpy number has significantly been improved by almost 10%.

5) During calculations, the specific heat capacity of the copper calorimeter was not included. This is

Heat conduction is when the heat transferred from one material to another through direct molecular contact. Heat generated deep in the body can be

If there is a difference of temperature occurs between any two bodies which are kept in thermal interactions, then heat transfer occurs. Basically, heat Transfers in three different modes: Conduction, Convection & Radiation

To achieve this, the final value from each thermocouple was set to be equal to the warm water bath temperature (370C), and the initial reading was set equal to the ice water bath temperature. Thus, for each thermocouple an equation was obtained using the two points to convert voltage readings to temperature. An example of the calibration for one of the thermocouples is shown in Appendix II.