# First Law of Themodynamics

I have been thinking alot about this 1st Law, where energy is neither created or destroyed and i am having difficulty understanding this.

After viewing a number of PBS shows about the universe is expanding based on Quantam Physics and the discussions of String Theory in which there may be more than one universe, not to mention the discussions of Quarks and Deep Energy which makes up 70% of the univers, DOES THIS LAW STILL MAKE SENSE AND IS IT STILL CORRECT?

Views: 323

### Replies to This Discussion

Yes, Jim, you are right, we mostly deal with the first law using classical thermo. It's still correct.

It's statistical thermo that deals with quantum states of atoms and particles. String theory and multiple universes are still under debate. A quark is just a sub-atomic particle which makes up matter. We do deal with deep energy retrofits using the first law of thermo, however, the search for dark energy in the universe has little to do with our daily tasks.

There is an area where advanced physics comes into play within the work of home energy pros: photovoltaics. Solar cells use sunlight as a radiation source to  induce electrons to transfer between different bands (i.e., from the valence to conduction bands) within the material, resulting in the buildup of voltage between two electrodes.

Also some of the electronic components we use like transistors, integrated circuits, diodes, make use of quantum physics and electrodynamics.

### The laws of thermodyamics still hold in regards to heat, energy, and work in the real world in which we live. From wikipedia:    [sorry, can't get rid of bold type]

The four laws of thermodynamics are:

• Zeroth law of thermodynamicsIf two systems are in thermal equilibrium with a third system, they must be in thermal equilibrium with each other. This law helps define the notion of temperature.
• Third law of thermodynamicsThe entropy of a system approaches a constant value as the temperature approaches zero.The entropy of a system at absolute zero is typically zero, and in all cases is determined only by the number of different ground states it has. Specifically, the entropy of a pure crystalline substance at absolute zero temperature is zero.

Jim, on second thought: Uh oh: entangled particles break second law of thermodynamics . The second law of thermo, or no perpetual motion machines, is being revisited. Quantum teleportation of light particles of 89 miles happened this year: Quantum teleportation using active feed-forward between two Canary ... . There will certainly be quantum technologies introduced into society and home energy applications within the next century. Great discussion topic!

Jim . . . I would add that plenty of things at the quantum level behave differently than what we are used to observing (and understanding) on the larger scale.   As an example, You might be interested in this video:   http://www.youtube.com/watch?v=DfPeprQ7oGc.

## Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy, under the American Recovery and Reinvestment Act) and brought to you in partnership with Home Energy magazine.

## Latest Activity

"You make some valid points, especially with the base rate charges. Increasing the base rate instead…"
1 hour ago
"Amen, make energy show it's true cost instead of subsidizing it. We have some of the lowest…"
1 hour ago
"The press report really doesn't give enough information to clearly answer why  they are…"
10 hours ago
"Gustavo, Thanks for the input. I agree with you in that I will be waiting till my system's…"
12 hours ago
"Any system that is out of warranty is really a coin toss as to whether it is financially better to…"
12 hours ago
"Such as Greensburg…"
14 hours ago
"Thanks, Ed, I get it now. I would just put in what my hvac guy tells me to put in: a \$17,000…"
14 hours ago
"Hi Tom, I'm sorry you didn't think my blog post was helpful or appropriate. I'll…"
16 hours ago
"Whatever happened to separation of church, state, and scientific home building science? What would…"
16 hours ago
Craig Savage's video was featured

### What is Building America

The U.S. Department of Energy's (DOE) Building America program is a source of innovation in residential building energy performance, durability, quality, aff...
20 hours ago
Jim Gunshinan's blog post was featured

### The Universe Is Made of Stories

The late poet and political activist Muriel Rukeyser famously said, The Universe is made of…See More
20 hours ago
Jim Gunshinan posted a status
"New blog post, "The Universe Is Made of Stories""
20 hours ago

© 2013   Created by Lawrence Berkeley National Laboratory.