What is Specific Gravity? | Arden's Questions

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Specific gravity is defined as the density of a substance compared to the density of water. A specific gravity of 780 indicates that the substance is 780 times denser than water. When calculating specific gravity, it's important to consider the reference temperature of the water used in the comparison. This ensures accurate measurements, particularly in varying environmental conditions. Understanding these factors is crucial for precise calculations in scientific contexts.
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Does anyone know what specific gravity is? If something has a weight of specific gravity of 780, what does that mean, do I need to take something into account before calculating?

Thank you - Arden
 
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Thank you - Arden
 
Specific gravity is the density of a substance divided by the density of water.
 
It is appropriate to always specify the reference temperature of the water (or air for gases).
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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