1.Write at least a paragraph explaining the relationship between temperature and density.
2. Write at least a paragraph explaining the relationship between salinity and density.
Answers
You probably know the equation
PV = n RT - (1)
Where,
P = pressure of the gas
V = volume of the gas
n = number of moles
R = Universal gas constant
T = Temperature of the gas
For a particular gas under constant pressure and constant number of moles. P,m(mass) and n becomes constant. So, the above equation (1) becomes…
V = κ T - (2)
Where, κ = constant and is given by κ = (nR)/P
But we know that,
Volume(V) = mass(m)/density(ρ)
Therefore equation (2) becomes
1/ρ = ΚT
Where, Κ = (nR)/(Pm)
i.e, 1/ρ α T
They are inversely proportional to each other, if the temperature is more the density will be less, because the volume increases upon increasing the temperature.
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As a common rule of thumb, for most pure liquids temperature is inversely proportional to the density. That is, temperature rise lowers the density, and lowering temperature will increase density. This rule is true for all liquids that shrinks on solidification with exception of water, which expands on solidification. Therefore, if you lower water’s temperature, it’s density will increase until temperature reaches to 4 Deg C. After that water’s density falls as it freezes at 0 Deg C. That’s why ice floats in water because it’s lighter than water.
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Originally Answered: What is the relation between density and temperature?
Well, that depends on what you’re looking at and what its current conditions are.
In general, most things we call solids and liquids have static densities because their volumes are definite.
In the case of things that we could call gases, we can look at the ideal case for general trends.
PV=nRT=mRTMW
Where MW is molecular weight.
We can find that density is then…
mV=MWPRT
This implies that density decreases linearly with temperature for all other things being the same. This makes sense because if you think of something being hot, it tends to expand, which would reduce its density.