Pv sentence example
Over the ellipsoid, p denoting the length of the perpendicular from the centre on a tangent plane, px _ pv _ _ pz 1= a2+X' b +A' n c2+A p2x2 + p2y2 p2z2 I (a2 - + X)2 (b 2 +x)2 + (0+X)2, p 2 = (a2+A)12+(b2+X)m2+(c2+X)n2, = a 2 1 2 +b 2 m 2 +c 2 n 2 +X, 2p d = ds; (8) Thence d?
Ramsay and Shields suggested that there exists an equation for the surface energy of liquids, analogous to the volume-energy equation of gases, PV = RT.
Since dE=dH - pdv, we have evidently for the variation of the total heat from the second expression (8), dF=d(E + pv) =dH+vdp=Sde - (Odv/de - v)dp .
In thiscase the ratio of the specific heats is constant as well as the difference, and the adiabatic equation takes the simple form, pv v = constant, which is at once obtained by integrating the equation for the adiabatic elasticity, - v(dp/dv) =yp.
The most natural method of procedure is to observe the deviations from Boyle's law by measuring the changes of pv at various constant temperatures.Advertisement
It is found by experiment that the change of pv with pressure at moderate pressures is nearly proportional to the change of p, in other words that the coefficient d(pv)/dp is to a first approximation a function of the temperature only.
But this procedure in itself is not sufficient, because, although it would be highly probable that a gas obeying Boyle's law at all temperatures was practically an ideal gas, it is evident that Boyle's law would be satisfied by any substance having the characteristic equation pv = f (0), where f (0) is any arbitrary function of 0, and that the scale of temperatures given by such a substance would not necessarily coincide with the absolute scale.
The characteristic equation of the fluid must then be of the form v/0=f(p), where f(p) is any arbitrary function of p. If the fluid is a gas also obeying Boyle's law, pv = f (0), then it must be an ideal gas.
Putting d0/dp=A/0 2 in equation (15), and integrating on the assumption that the small variations of S could be neglected over the range of the experiment, they found a solution of the type, v/0 =f(p) - SA /30 3, in which f(p) is an arbitrary function of p. Assuming that the gas should approximate indefinitely to the ideal state pv = R0 at high temperatures, they put f(p)=Rip, which gives a characteristic equation of the form v= Re/p - SA /30 2 .
The value of the angular coefficient d(pv)/dp is evidently (b - c), which expresses the defect of the actual volume v from the ideal volume Re/p. Differentiating equation (17) at constant pressure to find dv/do, and observing that dcldO= - nc/O, we find by substitution in (is) the following simple expression for the cooling effect do/dp in terms of c and b, Sdo/dp= (n+I)c - b..Advertisement
In this case dW=pdv=d(pv), a perfect differential, so that the external work done is known from the initial and final states.
According To The Elementary Kinetic Theory Of An Ideal Gas, The Molecules Of Which Are So Small And So Far Apart That Their Mutual Actions May Be Neglected, The Kinetic Energy Of Translation Of The Molecules Is Proportional To The Absolute Temperature, And Is Equal To 3/2 Of Pv, The Product Of The Pressure And The Volume, Per Unit Mass.
Van't Hoff showed that the osmotic pressure P due to a number of dissolved molecules n in a volume V was the same as would be exerted by the same number of gas-molecules at the same temperature in the same volume, or that PV = ROn.
We may observe that the equation (51) is accurately true for an ideal vapour, for which pv = (S-s)0, provided that the total heat is defined as equal to the change of the function (E+pv) between the given limits.
He suggested that the high value for S found by Regnault might be due to the presence of damp in his superheated steam, or, on the other hand, that the assumption that steam at low temperatures followed the law pv = R0 might be erroneous.Advertisement
Removing the summation signs in equation (52) in order to restrict its application to two points and dividing by the common time interval during which the respective small displacements ds and ds were made, it becomes Pdsfdt = Rds/dt, that is, Pv = Rv, which shows that the force ratio is the inverse of the velocity ratio.
A small proportion of PV contains cadmium, the oxides of which are toxic in very small doses.
It is noted that both the initial states have interior reversals in the sign of the latitudinal gradient of PV on isentropic surfaces.
These PV values are often exceeded during the summer monsoon period.
This technology is called solar photovoltaics or more simply, PV.Advertisement
Can either use a large gradient or a critical value of PV to define the tropopause; it depends what you are looking at!
Once having accepted the principle of constitutional government, the emperor-king adhered to it loyally, in spite of the discouragement caused by party struggles embittered by racial antagonisms. If in the Cisleithan half of the monarchy pv rliamentary government broke down, this was through no fault of the emperor, who worked hard to find a mod us vivendi between the factions, and did not shrink from introducing manhood suffrage in the attempt to establish a stable parliamentary system.
Can either use a large gradient or a critical value of PV to define the tropopause; it depends what you are looking at !
Photovoltaic cells, also known as PV cells, are the scientific term used for solar panels.
By 1958, Hoffman Electronics produced photovoltaic cells that were 9 percent efficient, and then the following year those cells were used to power Vanguard I, the first satellite to use PV technology for power.Advertisement
For the next ten years the PV technology, running at about 14 percent efficiency, were used in the space industry to power almost all satellite systems.
Photovoltaic cells, also known as PV or solar cells, are created from semiconductor material such as silicon.
Modern PV technology is called "thin-film silicon photovoltaics," and most experts within alternative energy industries consider it as the fastest growing energy technology.
Mainstream America has found PV off grid and the demand is high for information, the technology, and for the lifestyle change, it can bring to everyday life.
A PV off grid system built to sustain many users is called a mini-grid system.Advertisement
If you are already on or have access to a public electrical grid, consider making your change to PV off grid systems, gradually.
Read and study about the PV system and its accompanying hybrid systems.
If the planned PV system being built is big enough, they can offer you some useful suggestions, and may be able to purchase energy from you for feeding their grid system.
First Solar is the first manufacturer of thin film PV (Photovoltaic) modules and is revolutionizing the solar power industry.
Solar deck lights use a photocell, or PV panel, that charges a Nickel-Cadmium battery during the daylight hours.Advertisement
During the day the PV panels must have access to full sunlight for the solar deck lighting to work properly.
Today, "PV," as the town is called by its residents, is a world-class resort destination, drawing an average of five million vacationers each night.