from the end of this post http://22passi.blogspot.com/2011/07/improvvisarsi-scienziati-nellera-di.html google translation: "Still on the steam, further alleged weakness of the measurements by Rossi would be the speed of the steam outlet pipe. According to many critics, that speed would be too low for steam power rating. One might ask if this rate has never been measured by anyone. The answer is no, the only evidence available are videos on the Internet. This is an interesting point, because it is assumed to estimate from video, you do not know at what stage of the experiment relate, among other highly compressed, the speed of something that should be invisible, and say that this is insufficient. After abstruse calculations, which strictly does not take into account, as well as the uncertainties on the data available, including thermal losses, changes in the volume, pressure drop, slow, turbulence and condensation of steam at the exit of the tube has reached a value was approximately 10 m / s. This value seems excessive for the "puff" that you see in the video. To give an idea of the speed in question, you can compare it with something more familiar, like the flow of air produced by a sneeze or a cough: they reach speeds between 250 and more than 450 m / s. If you really need to draw qualitative conclusions, we could say that a sneeze or a cough does not seem so much faster than the flow of steam, which is likely the flow may be of the order of 10 m / s ...
What can we conclude then? That in the absence of data it is wiser to abstain from the proceedings rather than generating and spreading misinformation. That the information is correct and final testing and will come from official reports or direct experience. And the wait even longer is part of the scientific career: as it is normal to have to wait years to see published a work on a peer-reviewed, and normal have to wait several months to have official measures and well done on something is likely to profoundly change many of our beliefs and habits." Harry
