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Re: [Phys-l] not-anywhere-near-zero emission car




On 2011, Jul 14, , at 11:49, John Denker wrote:

On the other side, in applications where power density matters,
such as aviation, hydrogen will never compete with hydrocarbons,
including biodiesel.


Back in '55 I remember calculating bottles of compressed HC and O2 were much more E dense than a battery for rocket (space) use.


-- On one side, they would have to compete with battery-powered
plug-in cars. The distribution of electricity is probably always
going to be more convenient than the distribution of hydrogen.

Substitute H2 for natural gas (CH4)? Manufactured gas (water gas) is about 50% H2, and was piped, no?


But the auto would require a heavy tank and a compressor.

bc reads the next Prius model will have plug in , and is, therefore, "saving up".

p.s. in re. the above: for the first ~ five miles, from cold, the mileage is very poor (~ 25 mpg). For short trips plug in would be a great improvement.