Propiedades de los fluidos

1. DENSIDAD:

An important property of any material is the density, defined as mass per unit volume. A homogeneous material has the same density through this. We use the density ρ. If a mass m homogeneous material has a volume V, the density ρ is given as:

ρ=[pic 1]

1. PESO ESPECÍFICO:

The specific weight of a body or substance, is the relationship between the weight and the volume occupied by a substance either in solid, liquid or gaseous state. It is a constant in the sense that it is a value that does not change for each substance and that as weight increases also increase its occupied volume, as is the case with the density.

Pe=[pic 2]

1. MASA:

It is a fundamental physical quantity that indicates the amount of matter in a body. The unit of measurement of the mass, according to the SI (International System of Units) is the kilogram, gram, where one gram is one-thousandth of a kilogram (1 g = 0.001 kg) is also used.

m= [pic 3]

1. VOLUMEN :

Volume is the amount of space occupied by a body. Volume is the derived quantity, I e is found by multiplying three dimensions: length width and depth.

The unit in the international system to measure the volume is the cubic meter.

[pic 4]

1. TENSION SUPERFICIAL:

 Surface tension is the tendency of a liquid to provide a high free surface, ie, the liquid surface in contact with a gas tends to contract.

Liquids have two forms of molecular attraction: the cohesion allowing a liquid resist shear and adhesion that allows him to “stick “to other bodies.

The combination of the two forms of molecular attraction di origin to capillarity. When adhesion has a greater effect than the cohesion, it is said that the liquid is able to wet the solid surface with which it is in contact, suffering a rise in the contact point.

1. GRAVEDAD ESPECÍFICA:

The specific gravity is defined as the unit weight of the material divided by the unit weight of distilled water at 4 degrees centigrade. The specific gravity is represented by Gs , and can also calculate using any weight ratio of the water weight substance provided that equal volumes of material and water are considered .

The specific gravity is dimensionless and numerically coincides with the density.

[pic 5]

REFERENCIAS

• "http://www.sciencemag.org/cgi/content/summary/305/5688/1219e"

Fuente: Densidad.

• "National Institute of Standards & Technology - Guide for the Use of the International System of Units (SI)."

Fuente: Peso específico. 

• “http://maquinassimples24.blogspot.com/2010/06/gravedad-especifica.html”

Fuente: Gravedad Especifica.

• APUNTES DE MECANICA DE FLUIDOS_ocr.

Fuente: volumen, tensión superficial, masa.

...