A Summary of the Scientific Theories of Heat A pre-human species (Homo erectus) used fire for cooking and heat at least 500,000 years ago (maybe as long as 790 000 years ago), even though we have understood the science of heat for less than 200 years. The early Greeks thought fire (heat) was one of four basic elements, and as one of the four basic elements, it was contained in all substances. Scientists realized that there were more than 4 elements. Heat was then determined to be an invisible liquid called phlogiston. However, when some substances were burned, the ashes weighed more than the original substance. Where did this extra weight come from? By the late 1700’s the caloric theory of heat emerged. Caloric was said to be a massless fluid that occupied all substances. It could not be created, nor destroyed, but it could flow from one substance to another (always from warm to cold). A “calorie” was later defined as “the amount of caloric that would increase the temperature of 1g of substance, by 1oC”. Count Rumford’s Hypothesis was introduced when he was making cannons. Boring holes in metal made very hot shavings and drill bits. He realized that heat was the equivalent to energy. German physician Julius Robert Mayer found evidence to support Rumford’s hypothesis while making observations during a blood letting “treatment”. James Prescott Joule (1818-1889) receives credit for discovering the mechanical equivalent of heat. His developments lead us into the physics of heat and energy. The SI unit of energy,
Heat and Energy
February 7, 2013
The purpose of this paper is to discuss how the study of heat relates to the kinetic energy theory of matter. I will discuss what heat and temperature are, the relationship between them and their differences. I will provide examples of the various properties of a substance that will determine its heat capacity and various sources of heat.
In the 1840s scientists understood that heat was not just a substance but a form of energy that…
As with many philosophical theories, Eliminative Materialism is difficult to define, apart from the way it contrasts with other theories. Eliminativism is basically a specialized form of the identity theory; it’s main point of difference being that it denies the existence of intentional states. This means that an eliminativist believes that there are no beliefs or desires and (most likely) desires to tell us this. At first glance this theory seems totally useless, denying the existence…
Notes Heat and Temperature Unit C Grade 7
1. Theories of heat
Caloric theory of heat-
Heat energy was a substance (like a liquid or an invisible fluid) which flowed from a hot object to a colder one. But there is one weakness for this theory; why doesn’t the mass of the objects change if the ‘substances’ are flowing in and out of the objects. If the caloric theory of heat was real, the mass of the objects would change.
Heat as energy theory-
Heat was a form…
3) Use the laws of supply and
demand to explain why the cost to heat our homes and businesses goes up in winter time.
So let’s begin with the first question, which economic system is best suited for handling a crisis
of epic proportions. During the course of my research I looked over all the different economic
types and came to the conclusion that a socialistic economy would be best suited for handling a
crisis, at least in theory. In a socialistic economy all resources and productions are controlled…
2.3.2 Design considerations
When designing a passive solar system particularly for natural heating, the following factors must be put into consideration in order to obtain maximum heat.
i. The windows of the passive solar poultry brooder must face true south
ii. A portion of the south side of poultry brooder must have an unobstructed view of the sun.
iii. Properly sized roof over hangs must be used in order to provide shade to vertical south windows during summer months
2.3.3 Sizing of the brooder…
SYLLABUS – PMU 199 – The Poetry of Physics and the Physics of Poetry
Instructor: Prof. Robert K. Logan
Text: Poetry of Physics and Physics of Poetry – Robert K. Logan – World Scientific
THE APPROACH TO OUR STUDY OF PHYSICS IN THE
The basic concepts of physics are described in simple non-mathematical and non-technical language. The beauty of the ideas, namely, the poetry of physics, is presented.
A short history of development of the ideas will be given so that students can relate to the…
the scientific method. An observation must measure or describe something about the physical world.
Theory: A proposed explanation for observations and laws. A theory presents a model of the way nature works and predicts behavior that extends well beyond the observations and laws from which it was formed.
Experiment: A procedure that attempts to measure observable predictions to measure a theory or law.
Law of Conservation of Mass: define
Differentiate between measured…
The reasonable ways to reduce the heat
losses from windows
Bachelor Thesis of Energy System
Supervisor: Taghi Karimipanah
The window insulation always plays an important role in building design and thermal
comfort, it is one of the main parts needed to be optimized in building envelop.
Window insulation is a basic element which can decide the insulation capacity. The
large heat loss from the window is the main part of wasting…
accuracy, honesty and consecutive experiments ("Reliable."). “Knowledge” is facts, data and competence obtained through personal experience or education. It can be based on the theories or pragmatic experiments of an area of knowledge ("Knowledge."). Knowledge is categorized into share knowledge (passed through education, theories and communities) and personal knowledge (acquired from personal experiences, inherited skills and practical experimentations).“Evidence” is defined as testimonies, facts and…
There are literally hundreds of different steps that they go through but the main few include the heating of all the metals. While many of the applications used run from the beginning of the day to the end, the heat treatments of steel, iron and other metals usually run non stop.
When the heat is generated so hot, it pushes it into a furnace where they cause the reaction when made in contact with the other components and changes to form a new structure where newer metal is made. Like the iron making…