Water, apparent weight

Weight of metal object in air = 25.0 g Weight of metal object in water = 15.0 g Buoyancy = apparent weight loss = 10.0 g By Archimedes principle,... 

For a solid particle to float on the surface of a liquid, the total upward pull of the meniscus around it must balance the apparent weight of the particle for example, a waxed needle can be floated on the surface of water (Figure 6.6) and then sunk by the addition of detergent. The flotation of a solid on a liquid surface depends on the contact angle 0, and since 6 can readily be modified by factors such as surface grease, surfactants, etc., the conditions of flotation can also be controlled. 

We are being asked to calculate the apparent weight W pparent of a person who is totally immersed in water. To do this, we need to know the buoyant force and the true weight. The true weight is provided in the problem. In order to calculate Fb, we will need the density of water, which we will assume to be 1,000 kg/m3. In addition, we will need the volume in cubic meters (m3) instead of liters. Thus,... 

Because of the low surface energy of the alkane, the contact angle 0sh/a s zero and the circumference C of the fibre is readily evaluated. At the second stage of immersion, the apparent weight increase is due to the meniscii alkane/polar liquid (water or farmamide), as given by ... 

Under some circumstances, such as when the bubble size is very small and low gas flow rates are used, the concentrations of the VOCs in all phases are at thermodynamic equilibrium. In this case, the removal kinetics of the VOCs is given by Eq. (11) [82-84], where t is the removal time and k is the apparent removal rate constant, given by Eq. (12) [84]. is the water molecular weight, E is the mass of latex in the devolatilizer, and X is the mass fraction of polymer in the latex. 

Temperature. Apparent weight of x c.c. of water. Volume correspondine with an apparent weight of X gm of water. 

Having determined the weight of water contained in the flask up to the mark, the volume can be obtained from the table given above. For example, since an apparent weight of rooo gm. corresponds with a volume at 17° of 1002 3 C.C., the true volume of the flask is obtained from the expression... 

It may also be necessary sometimes to graduate a flask for one s self. In this case the flask, after being cleaned and dried, is counterpoised on a suitable balance the necessary weights are placed on the scale-pan, and distilled water is then poured into the flask until equipoise is obtained. In this case the last few cubic centimetres should be introduced by means of a pipette, any drops of water which may have formed on the upper part of the neck being first removed by filter paper. Since from the table we learn that the apparent weight of r c.c. of water at 17° is 9977 gm., the weights necessary for any given volume can be calculated. 

Use the molecular weight ratio to calculate the apparent extent of reaction of the caprolactam in these systems. Is the variation in p qualitatively consistent with your expectations of the effect of increased water content in the system Plot p versus moisture content and estimate by extrapolation the equilibrium moisture content of nylon-6 at 255 C. Does the apparent equilibrium moisture content of this polymer seem consistent with the value given in Sec. 5.6 for nylon-6,6 at 290°C ... 

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