Pressures 52 tension

Pco2—partial pressure (tension) of carbon dioxide, artery PDGP—pi ate let-derived growth factor PGEi—prostaglandin Ei (alprostadil)... 

Elasticity is the inherent property in bodies by which they recover their former figure or state after the force (stress) of external pressure, tension, or distortion have been removed (as for instance elasticity of gases, rubber, etc). Any force or distribution of forces which acts upon a body and is balanced by equal and opposite forces in the body is, in general, termed as a stress, although.the term is more particularly applied to the force per unit area acting upon the body. The change in size per unit size, or the change in some dimension per its unit, produced by the stress is called a strain. For each substance and for each kind of strain there is some limit beyond which Hooke s Law does not apply. 

Determination of gas pressures in expired air or blood depends on the application of certain physical principles (Table 27-4). The partial pressure of a gas dissolved in blood is by definition equal to the partial pressure of the gas in an imaginary ideal gas phase in equilibrium with the blood. At equilibrium, the partial pressure (tension) of a gas is the same in erythrocytes and plasma, so that the partial pressure of a gas is the same in whole blood and plasma. The partial pressure of a gas in a gas mixture is defined as the substance fraction of gas (mole fraction) times the total pressure. The tension of a gas in a liquid is, in fact, a measure of the chemical activity of the gas in the liquid. In the physicochemical literature, it is called the fugacity. 

The vapour nucleation takes place in water under negative pressures (tension) from -20 to -30 MPa while the minimum on the spinodale curve is arranges near -200 MPa. Skripov (1972, tabl. 15) observed similar situations for liquid water, mercury and chloroform, where the cavitation pressure is 5-7 times smaller than predicted by the theory of homogeneous nucleation for the spinodale pressure minimum. For benzol, vinegar acid, aniline and CCI4 the same ratio is 1.5-2 only. 

An analysis of a compound which contained nitrogen gave the following results 0.7280 gm. substance gave 68 c.c. N2 measured over water at 20° and 767 mm. pressure (tension of water vapor at 20° is 17 mm.). Calculate the percentage of nitrogen in the compound. 

The use of Eq. (3.41) would require only the knowledge of one pair of experimental surface pressure (tension) of individual solutions. The only parameter of the isotherm in Eq. (3.41), the molar area co, can be either calculated from the molecular geometry of the surfactant, or... 

Depending on the final polymer application, mechanical properties are considered to be the most important in everyday use where the polymer product is subjected to all kinds of external forces such as pressure, tension, vibration, or traction. The large number of polymers available allows a wide spectrum of mechanical properties to choose from, including very soft liquid-like, elastic or rigid materials. 

Laplace Law relates pressure, tension and radius of curvature in the following way ... 

Difference is not diversity. Diversity is given, but difference is that by which the given is given. .. Difference is not phenomenon but the noumenon closest to phenomenon. . . Every phenomenon refers to an inequahty by which it is conditioned. .. Everything which happens and everything which appears is correlated with orders of differences differences of level, temperature, pressure, tension, potential, difference of intensity (Deleuze, 2004, p. 280). 

The mechanical properties of pol5mieric materials, such as adhesives and sealants, have to be considered in all applications. The mechanical behavior involves the deformation of a material under the influence of applied forces. The force can be applied either in compression (pressure), tension, or shear modes. The latter is applied tangentially to the material, and is very important in structural adhesives. 

We can now relate Tn to the applied pressure-tension balance, eq. 1.8.5. Approximate the surface tension by Fi = T H and assume no external pressure pb = 0. Thus... 

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