1, differential pressure method: f floating =F upward -F downward, f upward =P upward, S= liquid gh 1S, f downward =P downward, S=p liquid gh2S).

2. Weighing method: f float =G-F(G: gravity of the object itself; F: indicator of spring dynamometer when the object is immersed in liquid. )

3. Principle method: F float =G row =m row g=p liquid gV row (Note: G row refers to the gravity exerted by an object to displace liquid; Line M: refers to the mass of liquid displaced by the object; P liquid: refers to the density of the liquid displaced by the object; V row: refers to the volume of liquid discharged by the object. )

4. Static method: When the object floats or suspends, F floats = G. ..

Buoyancy operation formula

1 Archimedes principle formula

According to the definition of buoyancy, Archimedes principle is obtained: F float =G row.

Further, it can be concluded that F float =G row =m row g=p liquid gV row.

When subscripts are used, f float = g object = m object g = p object gvrow = p object gvobject = p liquidgh and S-p liquid gh and s.

2. Ratio formula

Assuming that the object is floating (this is an important premise), then: p object: p liquid =V line: v object. Where V object =V line +V dew

Its variant: (P liquid -p substance): P liquid =V dew: V substance P substance: (P liquid -p substance) =V row: V dew, which is proved as follows.

7 object floating, F floating =G object, that is, P liquid gV line =p object gV object, that is, P liquid V line =p object V object, that is, P object: P liquid =V line: V object (across

Multiply).