How can a thermocouple be used to detect pressure under vacuum?
969455
hmmm, you're one confused puppy...go back to bed and stop smoking that stuff.
982646
electrotelethermometer.
391108
Are you mixing up a thermocouple for a thermal-switch. In all the applications mentioned above a thermal switch is used. The thermocouple is a lab device which is used to measure relative temperatures. A thermal-switch is an absolute device which either opens or closes at a given temperature.\n\nA thermal-couple is used to measure continuously the temperature while performing a experiment. It is usually attached to a component or surface being tested.\nThe results are compared to a controlled known temperature surface.\nUsually when testing to meet UL underwriters lab testing.
688178
The sources of error will always depend on the way you carry out the experiment. To measure the heat directly wouldn't work well. So you need to monitor the temperature at both ends. Monitoring the temperature at both ends, the errors will be the scale error of your measuring device, the quality of the thermal contact between the sensor and the fluid as well as the effect that the sensor has on the flow of the fluid (I'd use fibre optic sensors as they are non-invasive and don't have the problems asociated with using electrical test equipment in water).
443544
To start with, the air and water would leak out of the station. The vacuum would not leak in.\n\nOnce the water droplets had passed through the hole, they would boil almost instantly into a gaseous form.  This conversion from liquid to water vapor would absorb a lot of heat (latent heat of vaporization) thus causing the temperature around the reaction to drop. This would have the potential to freeze some of the water before it has a chance to vaporize.
354014
what sort of sensors are u interested in. if it is light then it can be measured using photoconductive or ptotovoltaic devices.
507971
With a pressure gauge.
587864
In electronics, thermocouples are a widely used type of temperature sensor and can also be used as a means to convert thermal potential difference into electric potential difference. A thermostat is a device for maintaining the temperature of a system within a range by controlling, either directly or indirectly, the flow of heat energy into or out of the system.
363367
something really harsh like paint stripper would have an effect as its quie volatile. if you can pour a flammable liquid into the tube such as petrol etc this will light from a distance but be super careful
768671
I am a paranormal investigator and have caught many things on tape.a cheap emf detector as long as it is used with caution can be found at wal-mart. in their hardware department. I use one called live wire. it is an ac sniffer just turn down the sensitivity way down and stay away from ac lines . and when you come across an emf field the tester will flash and beep.. cost about $10 have video of this in use investigator was standing still aking questions and telling spirit to make the tester beep faster or slower acording to the questions answer.. kind of cool.. \n\nhttp://www.kiestronics.com/nwopis
794147
You might work up some Q&A while showing this old demo of the effect of atm pressure...thereby adding some visual interest to the subject.\n\nAdd a few oz of water to a square-sided, metal, one-gallon can having a tightly fitted cap...bring to a vigorous boil (cap now off, please :-))..) and continue boiling until all air is expelled...screw cap in place and allow to cool...they will see the can collapse.\n\nWork up questions about the vacuum thus created (by the condensation of the water vapor) allowing atm pressure to exert its force.
224941
0ft/s. Sound doesn't propagate in vacuum
323880
I'm not sure what your question is.  A thermoelectric thermometer should have a sensor made of two metals.  It's a thermocouple.  Obviously the heat capacity of any metal is very low.
320485
What kind of detector?
360056
I'd forget the light sensors, way more complicated than is needed. You would need to compare voltage levels in the receiver(for infra red) or use a schmitt trigger (for a LDR[Light dependant resistor]) and there is a simpler way. Pressure pad on the floor. Then just use a 4017 counter chip (It's CMOS and i'm not sure of the number, it's been 2 years since I did electronics)\n\nMind you, depends what it is for and how accurate it is needed. It won't be quite as accurate as a infra red sensor(which would probably be the best method)as people could step over it if it is not that big but even infra red will be confused if two people walk through the door side by side.\n\nThe only method I can think of that is foolproof(besides a computer, a camera and some recognition software) would be a guy with a counter, but not so practicle.
647307
Try the sonometer or the resonance experiment
307158
Some pressure transducers are a piezo electric crystal and the pressure forms a voltage across the crystal. Works for sound as well.