Klimaforskning - hjemmeside
Startet av Okular, april 20, 2013, 16:46:36 PM
SitatMen atmosfæren ('drivhusgassene') begrenser ikke på noen måte unnslippelsen av varmestrålingen fra jordas overflate til verdensrommet. Den bremser ikke overflatens avkjølingsrate ved 'tilbakestråling'. Og den varmer den i hvert fall ikke opp direkte.
Sitat"[The First Law of Thermodynamics] says that energy is conserved – it can't be created or destroyed. What this means is that if a surface absorbs radiation it must have an effect on the temperature – compared with the situation where radiation was not absorbed.There's no alternative – energy can't be absorbed and just disappear."
Sitat"Therefore, if your current belief is that radiation from a colder atmosphere cannot 'change the temperature' of the hotter surface then you have to believe that all of the radiation from the atmosphere is reflected."
Sitat"Thermal energy is the part of the total potential energy and kinetic energy of an object or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through warming [...]"
Sitat"Microscopically, the thermal energy may include both the kinetic energy and potential energy of a system's constituent particles, which may be atoms, molecules, electrons, or particles in plasmas. It originates from the individually random, or disordered, motion of particles in a large ensemble, as [a] consequence of absorbing heat."
Sitat"In ideal monatomic gases, thermal energy is entirely kinetic energy. In other substances, in cases where some of thermal energy is stored in atomic vibration, this vibrational part of the thermal energy is stored equally partitioned between potential energy of atomic vibration, and kinetic energy of atomic vibration."
Sitat'THERMAL ENERGY' VS. 'HEAT'"Heat, in the strict use in physics, is characteristic only of a process, i.e. it is absorbed or produced as an energy exchange, always as a result of a temperature difference. Heat is thermal energy in the process of transfer or conversion across a boundary of one region of matter to another, as a result of a temperature difference.""Matter does not contain heat, but rather thermal energy [...]"
Sitat"When two thermodynamic systems with different temperatures are brought into diathermic contact, they spontaneously exchange energy as heat, which is a transfer of thermal energy from the system of higher temperature to the colder system."
SitatDISTINCTION OF THERMAL ENERGY AND HEAT"In thermodynamics, heat must always be defined as energy in exchange between two systems, or a single system and its surroundings. According to the zeroth law of thermodynamics, heat is exchanged between thermodynamic systems in thermal contact only if their temperatures are different [...]""If heat traverses the boundary in direction into [a] system, the internal energy change is considered to be a positive quantity, while exiting the system, it is negative.""In contrast to heat, thermal energy exists on both sides of a boundary. It is the statistical mean of the microscopic fluctuations of the kinetic energy of the systems' particles, and it is the source and the effect of the transfer of heat across a system boundary. Statistically, thermal energy is always exchanged between systems, even when the temperatures on both sides is the same, i.e. the systems are in thermal equilibrium. However, at equilibrium, the net exchange of thermal energy is zero, and therefore there is no heat."
Sitat"A change in thermal energy induced in a system is the product of the change in entropy and the temperature of the system.""Rather than being itself the thermal energy involved in a transfer, heat is sometimes also understood as the process of that transfer, i.e. heat functions as a verb."
Sitat"[...] hvis man har to like tannhjul koblet sammen, med kraft kun på det ene, vil det andre tannhjulet hvis det blir frikoblet ei god stund og mister rotasjonshastighet, få det kraftdrevne tannhjulet til å gå raskere rundt hvis de kobles sammen igjen."
Sitat"I have not read all the comments but it appears many who are commenting are mentioning supposed models or thought bubbles without having any real experience. The only thing that counts is actual measurement and then relating that to equations, determined from real experience, which could explain the process. This comparison process tells you if your measurements are reasonably accurate or the equations you are attempting to verify are wrong. I have had experience with measurement in furnaces. My experience is as follows:a) With a poorly insulated furnace there will be heat loss from the walls which results in a flame temperature less than the theoretical and lower energy in the exhaust gases.b) As the insulation is improved there is less heat loss from the walls, slightly higher flame temperatures, and higher energy in the exhaust gases.c) Even with perfect insulation it is not possible that the flame temperature exceeds that of the theoretical temperature, i.e. energy can not be created to exceed the energy input."
SitatIn a well insulated furnace the wall temperature is close to that of the flame (it is possible to estimate both).Insulation reduces heat loss but can not increase the original energy (or original temperature) of the source."
Sitat"You can't trap light in a bottle. That is, if a mirrored chamber prevents a luminous body from emitting to its surroundings, the light doesn't build up and get brighter and brighter inside. This may seem strange but it's true. A 'standing wave' is created by the mirrors instead. This is akin to the 2nd Law, wherein nothing happens when a heated body encounters another body at the same temperature, because no heat transfer is possible. So too, when a luminous source encounters its own light, there's no transfer of light to the source and thus no increase. Sadly for the GHE religion, then, you can't construct a Radiant Bomb by sealing a flashlight inside a thermos."