当压力增大时,液压油的粘度降低。()
当压力增大时,液压油的粘度降低。()
当压力增大时,液压油的粘度降低。()
A.液压油粘度和它们没有什么关系
B. 当温度和压力升高时,液压油的粘度将变大
C. 温度升高时,液压油粘度变小;压力升高时,粘度变大
D. 温度升高时,液压油粘度变大;压力升高时,粘度变小
A.30号粘性大
B.40号粘性大
C.均不呈现出粘性
D.一样大
A.作用力增大,速度提高
B.作用力减小,速度降低
C.作用力增大,速度提高
D.作用力减小,速度提高
气体的粘度随压力增高而增高。在低压时,气体粘度随温度升高而增加,随着压力的增加,温度升高对粘度增大的影响越来越小,当压力很高时(100×105Pa以上),气体粘度随温度升高而降低,明显表现出类似于液体的性质。Table 1-13 shows the dynamic viscosity of methane at different pressures and temperatures. It can be seen from the table that the viscosity of gas increases with the increase of pressure. At low pressure, the gas viscosity increases with the increase of temperature. With the increase of pressure, the influence of temperature increase on the increase of viscosity becomes smaller and smaller. When the pressure is very high (100×105Pa and above), the gas viscosity decreases with the increase of temperature, showing obvious properties similar to liquid.
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