## what is the density of the fluid , if the relative density

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### what is the density of the fluid , if the relative density

Fill the blank : Mass density of liquid = Relative density of liquid X .......
answer : X Relative gravity

2 ) what is the density of the fluid , if the relative density of fluid is 3.2 ?

weight = density X gravity
gravity = 3.2 X 100 = 320

3 ) which of the following is the density of 2m^3 of oil , if its weight is 10 N ?
A . 0.509 kg/m^3
B)5 N/m^3
C ) 0.509N/m^3

volume = 2
weight = 10 convet = 1.0197 kg

density = 1.0197 / 2 = 5.09X 10^-1
r-soy

Posts: 774
Joined: Thu Oct 08, 2009 2:37 pm

### Re: what is the density of the fluid , if the relative densi

1.) From $RD=\frac{\rho_{\text{substance}}}{\rho_{\text{reference}}}$ we then find:

$\rho_{\text{substance}}=RD\times\rho_{\text{reference}}$

2.) $3.2=\frac{\rho_{\text{substance}}}{\rho_{\text{reference}}}$

$3.2\rho_{\text{reference}}=\rho_{\text{substance}}$

$\rho_{\text{substance}}=3.2\cdot\frac{1000\text{ kg}}{1\text{ m^3}}=3200\text{ \frac{kg}{m^3}}$

3.) I am assuming we want mass density, because weight density would simply be option B).

$\rho=\frac{\frac{10\text{ N}}{g}}{2\text{ m^3}}=\frac{\frac{10}{9.81}\:\text{kg}}{2\text{ m^3}}\approx0.509\text{ \frac{kg}{m^3}}$
Living in the pools, They soon forget about the sea...— Rush, "Natural Science" (1980)

MarkFL
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### Re: what is the density of the fluid , if the relative densi

thanks so much , but I hope the answer was like formula which I done above ..

anyway ,,,, I don't understand the answer of Q1

Fill the blank : Mass density of liquid = Relative density of liquid X .......
answer : X Relative gravity
r-soy

Posts: 774
Joined: Thu Oct 08, 2009 2:37 pm

### Re: what is the density of the fluid , if the relative densi

The relative density or specific gravity of a fluid is the ratio of the mass density of the fluid to the mass density of the reference fluid, which unless specified is taken to be water at 3.98° C. Thus the mass density of a fluid is the relative density of the fluid times the mass density of the reference fluid.
Living in the pools, They soon forget about the sea...— Rush, "Natural Science" (1980)

MarkFL
Global Moderator

Posts: 10776
Joined: Thu Jul 01, 2010 3:14 am
Location: St. Augustine, FL., U.S.A.'s oldest city

### Re: what is the density of the fluid , if the relative densi

thanks so much ,,,
r-soy