Solar power is energy that is derived from the sun and converted into heat or electricity. It is a versatile source of renewable energy that can be used in an amazing number of applications, providing power for everything from cars and boats to houses and spacecraft.
A measurement of the acceleration spectral density (ASD) is the usual way to specify random vibration. The root mean square acceleration (Grms) is the square root of the area under the ASD curve in the frequency domain.
Materials have a moisture vapor transmission rate that is established by standard test methods. 1  One common set of units is g/mÂ²Â·day or g/100inÂ²Â·day. Permeability can be reported in perms, a measure of the rate of transfer of water vapor through a material (1.0 US perm = 1.0 grain/square-footÂ·hourÂ·inch of mercury â 57 SI perm = 57 ng/sÂ·m2Â·Pa).