Heat

Introduction Vapor pressure is the pressure of a vapor (gas) at equilibrium; equilibrium occurs when there is no net change between the amount of liquid and the amount of vapor because they balance each other. When the temperature of water becomes extremely low, as it does in this experiment, the rate of vaporization does not matter. The objective of this experiment is to determine the experimental heat of vaporization and compare it to the accepted heat of vaporization of water (40.7 kj/mol). The molar heat of vaporization is the amount of energy required to vaporize one mole of a liquid at one atm and the symbol ∆ Hvap is used. The process by which the molar heat of vaporization is calculated is though the slope of a graph. The volume of…

Introduction The first heat packs are believed to date back to 12th century China, during the winter locals would carry around hot rocks to use as portable “kairos”. Then, in the early 1900s, people began to use smoldering dried peat moss. The burning heat source was usually placed in a portable tin to keep in pockets. This report examines the chemical composition of a modern heat pack. Particularly, what is the most desirable configuration to prevent a human hand from getting frostbite.…

THE SPECIFIC HEAT CAPACITY OF WATER AND METAL INTRODUCTION. When the same amount of heat is transferred to two different objects, there is an increase in internal energy by the same amount but this does not necessarily cause a rise in temperature (Hudson, ND). The effect of heat transfer on temperature depends on the amount of heat energy transferred, the mass of the object and the specific heat capacity of the material of which the material involved is made (Hudson, ND).…

Introduction Heat exhaustion is a condition caused by exposure to extreme heat. Heat exhaustion means that your body is too hot. Your body cools itself by sweating. When your body cannot cool down, you could develop heat exhaustion. Untreated heat exhaustion could lead to heat stroke. Heat stroke can be deadly. Elderly adults have a greater risk for heat exhaustion than younger adults. Other adults who may be at higher risk are those who are overweight, have high blood pressure, or have heart…

about doing all the things that could not be done during the dreary months of winter. Although summer is filled with activities, the heat of the day could put you at risk. Overheating can lead to heat exhaustion or even a heat stroke. Knowing the signs could save your life or others. Heat exhaustion and heat stroke may be caused by a number of reasons, while the repercussions can be detrimental to health, and these conditions affect both humans and animals. During the heat of summer, outdoor…

When we think of Summer, often we are concerned with how to keep ourselves and our pets cool. The blistering heat and fierce humidity in the Midwest are prevalent weather trends and make it difficult to reside outside. Our community warns us to stay hydrated, wear sunscreen and a hat and stay out of the sun when the heat is at its peak. When it comes to our pets, we are told to put out extra bowls of water for Fluffy and Fido and provide them with shelter and shade. In the heat of the…

This is caused by the base assumption of the ‘Principle of Heat Exchange’, which is that the principle only holds true if heat is not lost to its surroundings. Although, the loss of heat to its environment (ex. Desk, air, cup, etc.) was attempted to be minimized by quick transfer of the water and object, and the use of a calorimeter, the data proves that there was a loss of heat as the theoretical temperature was higher than the resulting temperature. 2. For part two, compare your specific heat…

the specific heat capacity of a substance? It is the amount of energy required to increase the temperature of one gram of a body by one Kelvin unit, expressed as J/K/g. The specific heat capacity also can be measured in J/K/Kg and J/K/mol. Substance Specific heat Capacity (J/K/g) Water 4.18 acetone 2.17 hexane 2.26 Compare the specific heat capacity of water with a range of other solvents. The table compares the heat capacities of water and two other solvents. Compare the specific heat…

Home Care and Avoiding Heat Stroke Heatstroke is the most serious of the heat-related conditions typically known as heat cramps, heat exhaustion, and heat stroke. Heatstroke is a critical condition requiring immediate medical attention. According to WebMD, if it is not treated in time, it can damage the brain, heart, kidneys' and muscles. In a short time, heat stroke will lead to death. Heat stroke is contrasted from the serious but not usually fatal heat exhaustion in a couple of ways.…

Description of the proposed heat release rate model. The cylinder gas is considered as a spatially homogeneous thermodynamic system occupying in a single zone for the compression, expansion, intake, exhaust processes and two zones (burned and unburned zone) for the combustion process. The instantaneous composition of cylinder gases are obtained from the mass fraction of fuel burned. The instantaneous thermodynamic properties are computed by the established equations [20-21, 28]. The…