Does the resistance of the thermal electron in the oil change greatly in the air?

There are two forms of air that are free in the lubricating oil: bubbles that remain inside the oil, and bubbles that float on the surface of the oil. When the bubbles float to the surface of the oil, they become foam. The time it takes for air bubbles to rise to the oil surface is what we call the air release of lubricating oil.

It must have something to do with atmospheric pressure.

The lubricating oil air release value tester is suitable for testing the ability of lubricating oil to separate aerosol air, such as gas turbine oil, hydraulic oil and other petroleum products.

When using the instrument, the sample is heated to a certain temperature, and by blowing excessive compressed air into the sample, the sample is stirred violently, and the air forms small bubbles in the sample, that is, fog bubble air. The time to decrease in the volume of aerosol air in the specimen is recorded after the gas stop.

No. This product is white or type tung slag white shiny crystals; Odorless, slightly bitter taste; The color gradually darkens when exposed to air and light. This product is soluble in water, slightly soluble in absolute ethanol, and very slightly soluble in chloroform or ether.

The melting point of this product (Appendix C) is 243 249.

No, an air dryer is to filter moisture or other volatile liquid components in the air, and the air is kept dry.

The resistance of the fixed value resistor increases, the total current decreases, and the resistance voltage of the other resistance does not change, and the total voltage does not change, so the voltage at both ends of it becomes larger.

It's definitely not right. According to the density of the substance, the density of water is greater than that of oil, so oil floats on it, but water will not be lighter than air, otherwise water will float in the air.

The specific gravity of water is greater than that of oil and less than that of air. The specific gravity of water is 1, oil is, and air is.

Water is lighter than air? Is this called a problem? It doesn't take you 3 years old to know that water is heavier than air.

Not necessarily, that needs to consider their mass, volume, density.

When you take out the cup from the refrigerator and put it in the air, you will find that many small water droplets will soon appear on its surface, because the temperature of the cup is low, and the air contains water vapor, which turns into liquid water when cold and condenses on the outer wall of the cup

Formation of small water droplets: the action of water surface tension.

It can be seen as a "pulling" force in the molecules on the surface of the water, which makes the water exist in the form of the smallest surface area possible, and the smallest surface area when the volume is a certain amount is a sphere.

Of course, due to the equal action of gravity, dust, and oil, it will not be a normal sphere, and the liquid surface has a property called surface tension, which is the mutual gravitational force between adjacent parts of the liquid surface. This tension makes the surface of the liquid like an elastic sheet. Surface tension causes a liquid that is not subject to external force to form a round shape.

Because for an object of a certain volume, the surface area of the spherical surface is the smallest. As a result, the molecules of the water droplets always try to move closer together, so that the surface area is reduced, so that it is round, or spherical.

Because the temperature of the cup is low and the temperature on the outside is high, the gas on the outside liquefies to form water droplets on the outer wall.

Water vapor in the air condenses.

The water vapor outside condenses when it hits the cold cup.

Lan Lan always plays with the scales at home, constantly asking this and that, always asking Qingchang's mother to call her to see how much she can grow every day. One day, my mother was holding a long glass bottle in her hand and said to Lan Lan: "Think about it, there is a bird in the bottle of my brother's quarrel, and now my mother puts this bottle on the scale and weighs it, but the bird flies in the bottle, will the weight of the scale change?"

Lan Lan didn't come up for a while. Please help Lan Lan think about it.

Answer] There is no change. Because the weight of a bird flying in the air is supported by the air.