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Chapter 7 -- Part 4
Surfactants are used in research.
In certain types of experiments, water must be dissolved in the proteins.
The end of the surfactant molecule is on the surface of the protein.
The aligned ends surround theProtein, solubilizing it in the water.
The substance from their abdomen reduces the surface tension behind them.
They are propelled in a forward direction.
The effect is similar to cutting a taut rubber membranes and pulling it apart, each section moving away from the cut.
Marangoni propulsion can be demonstrated by placing a toothpick in water and coating it with soap.
The toothpick gets away from the dissolved soap because of the reduced surface tension behind the coated end.
Experiments show that the surface tension of water is reduced by insects.
Chapter 9 describes the importance of surfactants in the process of breathing.
Almost all of the body is submerged with the nose above the water.
The power used by a woman in this position is calculated.
It is assumed that the density of the animal is greater than the fluid in which it is submerged.
If the situation is reversed, the immersed animal will rise to the surface, and it will need to use energy to stay below the surface.
How is it?
The relationship is shown.
The density of an animal can be obtained by weighing it first in air and then in a fluid.
The first thing to do is start with Eq.
Determine the pressure needed to withdraw water from a capillary with a 10 cm radius.
Measure the SMT with an instrument.
The insect's mass is 3 x 10-2 g and its linear dimensions are 3 x 10-1 cm.
The text provides surface tension values.
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