Can a gas diffuse in a gas?how about a gas in a liquid?give example?
diffusion is the movement of paricle from a region of higher conc. to a region of lower conc. therefore a gas can diffuse in a gas if either one is conc. in one point and the same goes for gas in liquid example: u can smell the fart of someone else even though he's sitting at the other end. that's because his fart diffused into the air you breathe in.
Why can't radio waves transmit through water?
Actually, radio waves can penetrate water. What limits transmission is conduction, and sea water is very conductive, and largely, in the case of sea water, absorption. Together they they severely limit high frequency (short wavelength) transmissions; however, low frequency (long wavelength) radio does travel through a little better. How deep any particular frequency penetrates is dependent on what physicists and electronic engineers know as attenuation or absorption. While the following web page will be far too advanced for the casual physics reader, the graphs within will give you the quick idea that radio is easily absorbed at higher their frequencies: How is radio wave propagation modelled in seawater? Some of the data in this writing comes from elsewhere, such as http://millitsa.coe.neu.edu/site... .References: How is radio wave propagation modelled in seawater? Calculation of absorption of sound in seawater.Were the ocean made of something metallic, say mercury, because the conductance is so much higher far less signal would penetrate. There would be more reflection than absorption. If the oceans were of pure water, likely far more radio energy would travel through.While this answer is hardly complete, it should give you a taste of its complexity.The following plot comes from a 2012 paper by Emma O’Shaughnessy. It “explicitly shows how the conductivity of water with a relative permittivity of 81 can greatly effect its electromagnetic propagation.” Translation: radio waves get progressively weaker the deeper they penetrate into salt water, and that attenuation is a function of salinity.Another interesting visual comes from Gussen et al., in their paper “A Survey of Underwater Wireless Communication Technologies:”