russ_watters's latest activity
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russ_watters replied to the thread Undergrad Have we found an ancient space habitat?.But they're asteroids? Where would the implication that they could be hollow space stations even come from? It makes no sense and... -
russ_watters reacted to Baluncore's post in the thread Undergrad Have we found an ancient space habitat? with
Like.
Why do aliens need to simulate gravity by spinning a rock ? Residents, with a vestibular system, could not just look the other way. -
russ_watters reacted to Ken Fabian's post in the thread Undergrad Have we found an ancient space habitat? with Like.
No reason to think they are artificial and extraordinary claims require extraordinary evidence - but making them increases the views and...
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russ_watters replied to the thread High School Fan is pushing in the front and sucking from the back.Right, that's why I'd teach the proper definition. You wrote that backwards, didn't you? I think fluid goes out through the inserted...
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russ_watters replied to the thread High School Fan is pushing in the front and sucking from the back.I mean, to me that's just rejecting the word "suction" without recognizing what it actually means. I don't see how understanding the...
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russ_watters replied to the thread High School Fan is pushing in the front and sucking from the back.Yeah, some people don't like the implication of negative pressure in the word; Absolute pressure can't be negative. But to engineers...
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russ_watters reacted to weirdoguy's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Isn't that 'sucking' by definition?
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russ_watters reacted to johnthekid's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
It seems to be kind of looks like more of a semantic issue.
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russ_watters reacted to Baluncore's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Referring to the front and back can be confusing because it depends on how you look at it. Maybe refer to the air inlet and outlet, the...
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russ_watters reacted to Lnewqban's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
The blades of any type of fan transfer kinetic energy into the mass of gas that is surrounding them. That energy is observable as...
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russ_watters reacted to berkeman's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Cheaper fans use flat blades at an angle. Better fans use airfoils at an angle (like a propeller). Here is a good PF Insights article...
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russ_watters replied to the thread High School Fan is pushing in the front and sucking from the back.Yes, though for your typical desk or central air conditioning fan the air can be considered incompressible for calculation purposes...
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russ_watters replied to the thread High School Fan is pushing in the front and sucking from the back.Yes. I'm not sure what sort of answer you're looking for with that question. The blades are curved to force air to move in a preferred...
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russ_watters reacted to jrmichler's post in the thread Thermal mass flow sensor vs. thermal flux sensor with Like.
Thermal mass flow sensors measure mass flow, normally of a gas such as air. The output has units of mass per time, such as kg/sec...
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russ_watters replied to the thread Windows 10 Now Not Supported.It's a massive security risk and a conscious choice to avoid it. The Target hack 10 years ago happened because an HVAC controller was...