densimeter，densitometer
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- disjoining pressure
- conical pendulum
- vapor pressure
- viscous solid
- algebraic
- particle-number operator
- capillary electrical phenomenon
- ritz formula
- residual heat
- early-type star
- relativistic astrophsics
- distributed ion pump
- sturm liouville equation
- kennelly heaviside layer
- ceiling light
- trichromatic equation
- magnetic induction flux
- Four-dimension Momentum
- deflection field
- complex refractive index