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Stream of electrons produced at the negative electrode of a tube containing a gas at a low pressure?
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∙ 11y ago
cathode ray
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∙ 11y ago
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Can bourdon's tube pressure gauge be used to measure negative pressure?
Bourdon's tube pressure gauge cannot be used to measure negative pressure. This is because absolute pressure must be measured and the Bourdon gauge only indicates the gauge pressure.
If air enters the intrapleural space?
The lung will collapse (atelectasis) because the negative intrapleural pressure gradient that keeps the lung inflated has is now at equilibrium with atmospheric pressure.
Why can cases of pop be stacked so high?
That is because the bottles containing the pop are particularly strong, have considerable internal pressure and can resist a fair amount of compressive stress.
When you place your finger on the plunger of a syringe containing some water it does not depress noticeably?
no it only depresses if you apply pressure. If the finger is just resting on it the liquid inside will remain there.
What gauge measures both vacuum and pressure?
Gauge pressure usually refers to the pressure difference between ambient, atmospheric pressure and the pressure in a vessel or line. A gauge pressure of zero would mean that the vessel or line was at atmospheric pressure. Normally the pressures of interest are ABOVE atmospheric so the gauge pressure is positive. Vacuum gauge pressure measures how far BELOW atmospheric pressure a vessel or line is. As such vacuum gauge pressure may be measured as a negative number - or for convenience it may be reported as a positive number with the caveat that it is "vacuum gauge pressure", meaning that the reported pressure is how far atmospheric pressure is above the pressure in the vessel or line.
What is the redox reaction takes place in a dry-cell battery?
The MnO2 would like to take electrons from the Zn much the same way that a bully would like to take someones lunch money. The problem for MnO2 is that it is not touching the Zn. The MnO2 is touching the graphite electrode and is trying to pull off the graphite electrons. Graphite is tougher than Zn and will not give up electrons but there is a tug. The graphite makes the positive electrode of the cell. On the Zn side, the Zn is the electrode and the electrons are not held very well by Zn. So the Zn electrode has pressure of electrons wanting to leave and the graphite electrode has suction that wants more electrons. The pressure difference can be measured as 1.5 volts. Volts are used to measure electrical pressure. When a light bulb or something is connected then electrons from the Zn electrode have a path to go to the graphite electrode. The graphite is willing to give electrons to MnO2 because it can get them back from the Zn through the circuit. Also when the Zn electrode loses 2 electrons a Zn atom turns into an ion and dissolves in the electrolyte. Because of its positive charge it is attracted to the correspondingly formed negative charge at the graphite when MnO2 took an electron.
How did William Crookes determine the nature of the beam in cathode ray tube?
In his investigations of the conduction of electricity in low pressure gases, William Crookes discovered that as the pressure was lowered, the negative electrode (cathode) appeared to emit rays (the so-called cathode rays, now known to be a stream of free electrons, and used in cathode ray display devices).
How current electricity moves in a circuit?
You need a source of electrical potential difference, also known as voltage (which is the technical term for what for you call "electric pressure"). The easiest and most common voltage source is a household battery. Hook up the positive electrode of the battery using a conductor (eg. a copper wire) to one end of your circuit and the negative electrode to the other end, and voila, you'll have electric current flowing through your circuit.
How do you measure negative pressure?
negative pressure is measured in negative inches of mercury
When was Negative pressure ventilator created?
Negative pressure ventilator was created in 1928.
Is electricity produced when electrons have been removed from an atom?
Not quite that simple. An atom would be positively charged in that case. Electricity is a flow of electrons in a material (electrons moving from one atom/molecule to another. The material has to be able to allow the flow of electrons and is usually called a conductor when it is able to do so (the opposite is an insulator when the material does not allow electrons to flow). Example - copper wire easily allows electrons to flow. To make the electrons flow an electrical pressure must be applied to the wire. Pressure can be produced chemically or mechanically. A battery is a chemical means of producing an electrical pressure. A battery contains a chemical and 2 electrodes (Put simply - bits of metal dipped into the chemical). One electrode is designated the positive and the other the negative. When the electrodes are connected together the chemical reaction in the battery causes electrons to flow in the chemical and they move to the negative terminal and out of the terminal into the conductor connecting the positive and negative terminals. When the terminals are not connected to anything there is no electricity but depending on the chemical and size/construction of battery there is a potential for electricity. For example a potential to produce a pressure of say 12 volts; where volts is the unit of measurement of potential difference (pd) in pressure - ie there is a potential pressure difference of 12V between the 2 electrodes. The mechanical means of producing electrical potential difference is achieved by moving a conductor in a magnetic field. The speed of movement and strength of magnetic field are 2 factors in what size of potential difference is created between the ends of the conductor. The mechanical device being an alternator to produce alternating electrical flow or a dynamow to produce flow in one direction only.
In an electric circuit why do the electrons go from the positive side of the battery to the negative side?
The short answer is that they don't. But that doesn't help you much. Electrons flow from the negative terminal to the positive terminal. Why? Negative and positive (opposite) charges attract each other, and like charges repel each other. So you can think of the positive charged end pulling electrons towards it, as well as the negative charged end pushing electrons away from it. Water makes a good analogy, the battery is a pump, so there is high pressure on the outlet of the pump ( the negative terminal ) through the pipes and whatnot, ( the wire and whatnot) to the inlet of the pump ( the positive charged end ).
Is all peer pressure negative?
Not all peer pressure is negative. Positive peer pressure can encourage individuals to make healthy choices, try new things, or achieve their goals. It depends on the situation and the influence of the peers involved.
When is intrapleural pressure most negative?
Intrapleural pressure is most negative at the completion of inspiration.
What is the direction of flow of conventional current?
from the more positive point to the less positive point in the circuit
What is the maximum negative pressure can be reached in a system?
The maximum negative pressure in isolated system is negative ATM. ATM is the pressure created by air molecules and it is 1.01325*10^5 Pa. So a negative pressure of 1 ATM means absolute vacuum.
How is the electron flow different from conventional current?
The conventional current direction is the direction in which a positive charge would move. Since electrons are negatively charged, the electrons move (in average) in the opposite direction.AnswerBefore the structure of the atom was understood, scientists such as Benjamin Franklin believed that an electric current was a flow of some sort of mysterious 'fluid' that moved from an area of high pressure to an area of low pressure. The high pressure was considered to be 'positive' pressure and the low pressure was considered to be 'negative pressure'. So, for many years, current was believed to travel from positive to negative, but it had nothing to do with 'a flow of positive charge carriers' because no-one then knew about 'charge carriers'.Even though we now know that (in metallic conductors, anyway) that current is a flow of free electrons from negative to positive, for some weird reason many textbooks still show current as flowing from positive to negative! To differentiate between the two current directions, we use the terms 'electron flow', and 'conventional (or 'Franklinian') flow'.
