A blog exploring if there are only photons. As discussed in part 3. Quantum Mechanics and Path Integrals.

Thursday, September 23, 2010. Let us learn about density of glass. For comparison, from less dense than aluminum to more dense than iron at standard conditions. Flint glass contains lead, which is a very dense element. So Flint glass can be so much denser than crown glass. In our next blog we shall learn about integral de ln x.

Studying Physics and Enjoying Life in Alaska. Wednesday, January 11, 2012. Additionally I have a photo site at lwpetersenphotography. Sorry for the inconvenience, but so far I am happier in that location. Thanks! Posted by Lee Petersen. Sunday, November 27, 2011.

Physics in day to day life. 3 Ways to Conserve Energy. It is necessary to conserve coal and petroleum resources of the earth by reducing their consumption so that they may last for as long as possible. Coal is used mainly to produce electricity. So, if we can save electricity, then the consumption of coal will be automatically reduced. The use of bio gas as domestic fuel should be encouraged in rural areas.

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