1 / 9

Pioneers of Heat Theory

Pioneers of Heat Theory. People have not always known about the nature of heat. Is it a fluid of some sort? Some type of energy? Do things just get hot because you add heat?. Joseph Black(1728-1799). Different substances have different heat capacities. I regard heat as a

hunter-weiss
Download Presentation

Pioneers of Heat Theory

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pioneers of Heat Theory • People have not always known about the nature of heat. • Is it a fluid of some sort? • Some type of energy? • Do things just get hot because you add heat?

  2. Joseph Black(1728-1799) Different substances have different heat capacities. I regard heat as a fluid called caloric. When an object heats up, it gains caloric, and when it cools, it loses caloric. Logical conclusion in my opinion! Caloric has no mass or volume…

  3. Benjamin Thompson, aka Count Rumford (1753-1814) While drilling out cannons in Munich, I noticed that the cannon became hot as long as the friction of boring continued. I concluded that heat was not a substance, but a form of vibratory motion. Hence my views are in contradiction to the caloric theory. And, I might add, much more logical...

  4. Humphrey Davy (1778-1829 ) I agree withCount Rumford! Heat is a form of motion. Heat is not a substance. I was able to prove this experimentally by rubbing two ice cubes together at below zero, and observing that they melted… contradicting the caloric theory. Cool, eh?!

  5. James Joule ( 1818-1889 ) I was able to quantify Heat!! I did this by measuring changes in temperature produced by the friction of a paddlewheel attached to a falling weight. This work led to the idea that 1 calorie = 4.18 Joules. Science teachers often tell you to memorize this, and they round it off to 4.2 J…

  6. Maxwell (1831-1879) and Boltzmann (1844-1906) I’m Maxwell! And I’mBoltzmann !

  7. Maxwell (1831-1879) and Boltzmann (1844-1906) Alright! Go ahead – you tell them... I… (ahem)… WE formulated the Maxwell-Boltzmann Kinetic Molecular Theory…known as the KMT… Pretty impressive, eh?

  8. Team work pays off... This theory states that heat is a form of energy, and… Temperature is a measure of the kinetic energy of the individual particles - atoms, molecules, etc.

  9. Heat Versus Temperature • Temperature is the amount of average kinetic energy within an object. • Heat is a form of energy. • The amount of heat an object holds depends on several factors: temperature change (∆T), mass, and the specific heat capacity (C) of the object. • Q (quantity of heat in joules) = m C ∆T

More Related