What Is The Density Of Blood? 

density of blood

Does blood have density? If yes, then what is the density of blood? So, to know this, you need to read this article till the end. What is blood? Blood is liquid tissue composed of roughly 55% fluid plasma and 45% cells. The three main types of cells in the blood are white blood cells, red blood cells, and platelets. 92% of blood plasma is composed of water and the other 8% is composed of proteins, metabolites, and ions. Blood plasma and its contents are known as whole blood. Therefore, the blood density is a combination of the density of the plasma and the density of other fluids in the blood. Let me tell you about the density of blood

What Is The Density Of Blood?

The density of blood is 0.994 g/mL ± 0.032 g as you know the blood is a combination of plasma and other fluids. Therefore you should know about the density of plasma also. So, the density of blood plasma is approximately 1025 kg/m3. Blood density varies with body posture. Venous blood density is higher when a person is standing than when he is sitting. Blood density also changes from species to species and between genders within a species. The average blood density in males is 1053 ± 1.7 kg/m3 while the average blood density in females is 1052 ± 1.0 kg/m3. The blood density is measured in different units, let’s see it. 

The density of blood in g/cm3 is 1.10 g/cm while the density of blood in g/mL is 0.994 g/mL ± 0.032 g. There is a question that always pops up on the internet is the density of blood is equal to water? Yes, the density of blood is nearly equal to the density of water, and it was proved by various studies. Therefore, you don’t need to again study the density of blood vs water.  

Well, you know the density of blood in kg/m3 and also in other units also. Let’s see the definition of blood density in detail. 

Definition Of Density Of Blood

The density of the blood is defined as the total mass of the blood to the total volume occupied by the blood. Blood density is proportional to hematocrit or, more exactly, to the total protein concentration of the blood. Only to a minor extent is blood density influenced by other plasma solutes. This definition in the symbolic form is given below as, 

The Density Of Blood = Mass of Blood/Volume of Blood g/mL 

Or this can be denoted in its symbolic form as, 

                                ⍴ = mv g/mL 

Where,  ⍴ is the density of blood 

              m is the mass of blood, and 

              v is the volume of blood 

So, you know the formula to calculate the blood density, but you should know how to calculate the blood density. Therefore, below we have given an example. 

How To Calculate Density Of Blood?

So, to calculate the blood density there are multiple methods, including classical technique and mechanical oscillator technique. Let’s understand them in detail. 

  • The classical technique to measure the density of fluids consists of a determination of mass and volume.  
  • With the mechanical oscillator technique for the continuous recording of fluid density a sizable amount of experience has accumulated. But it is a complicated method to measure blood density. 
  • Another method is the sound velocity method in which blood density is measured by passing a sound wave. 
  • You can also calculate blood density by a formula. Refer to the example given below. 

For example, if the mass of blood is 10g and its volume is 5 cm3 then what will be its density? 

So, The Density Of Blood = Mass of Blood/Volume of Blood g/mL  

                                         = 10/5 = 2 g/cm3

Let’s find out the densities by visiting Denseme


How Do You Find The Density Of Blood?

By substituting the mass and volume of the mixture into (1),we obtain its density ρ: ρ=104. 34100 gcm3=1. 0434gcm3 ˙= 1,04 gcm3. The density of blood is the same as the density of the mixture: ρblood ˙= 1.

What Is The Density Of Blood In Adults?

Around 1060 kg/m3

Blood accounts for 7% of the human body weight, with an average density around 1060 kg/m3, very close to pure water’s density of 1000 kg/m3.

Does Blood Density Vary?

Venous blood density is higher when a person is standing than when he is sitting. The following charts show the venous blood densities of 6 subjects as they change body positions during a 10 minute period. Blood density also varies from species to species and between genders within a species.

What Changes The Density Of Blood?

Strong vasoconstriction apparently increases the capillary pressure and thus raises the blood density by the loss of plasma-ultrafiltrate. During hemodialysis the fluid loss into the dialysator tends to increase the blood density.

Is Blood Density Greater Than Water?

Blood Density Is Nearly Equal to Water Density: A Validation Study of the Gravimetric Method of Measuring Intraoperative Blood Loss. J Vet Med.


Well, you have an idea about blood density as well about its calculation methods. And also you get clear that the density of blood is more than water is a myth and these both densities are equal. It is because the blood is also a liquid, in fact it consists of a large percentage of water. Blood density changes with the human posture as we have mentioned above. So you have got all your doubts cleared regarding the density of blood.


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Albert Howard

Albert Howard

I am Albert Howard. I love traveling and exploring new places. So I always keep visiting new places to fulfill my passion. Writing is my second passion and i write and sharing my travelling experiences by this. Its always fun to travel and write about it.