Categories
Physical Chemistry

Electrical Properties of Colloids

Science > Chemistry > Colloids > Charge on Colloidal Particles The colloidal particles carry an electric charge. The most important property of colloidal solution is that all suspended particles possess either positive or a negative charge. i.e. they carry the same nature of the charge. The mutual forces of repulsion between similarly charged particles prevent […]

Categories
Physical Chemistry

Properties of Colloids

Science > Chemistry > Colloids > Properties of Colloids In this article, we shall study the general, mechanical and optical properties of colloids. General Properties of Colloids: Heterogenous Character: The ultramicroscopic examination indicates that colloidal dispersion is a heterogeneous system consisting of a continuous dispersion medium and discontinuous disperse phase. Visibility: Colloidal particles cannot be seen […]

Categories
Physics

Change in Surface Energy

Science > Physics > Surface Tension >Change in Surface Energy In this article. we shall study numerical problems on the change in surface energy due to breaking of drop or coalescence of number of drops into a one drop. Example – 01: Two mercury drops one of radius 2 mm and the other of radius […]

Categories
Physics

Numerical Problems on Surface Tension

In this article, we shall study numerical problems to find surface tension of liquid. Science > Physics > Surface Tension > Numerical Problems on Surface Tension Example – 1: A needle 5 cm long can just rest on the surface of the water without wetting. What is its weight? Surface tension of water = 0.07 […]

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Physics

Concept of Surface Energy

Science > Physics > Surface Tension > Concept of Surface Energy In this article, we shall study the concept of surface energy, relation between the surface energy and surface tension. A molecule on the surface of a liquid experiences a downward pull due to surface tension.  If a molecule deep inside the liquid is to […]

Categories
Physics

Surface Tension in Everyday Life

Science > Physics > Surface Tension > Surface Tension in Everyday Life In this article, we shall study different phenomena due to surface film formed on the liquid surface due to surface tension. Examples of Surface Tension (Due to formation of the surface film): When a glass rod is dipped in water and taken out […]

Categories
Physics

Surface Tension

Science > Physics > Surface Tension > Surface Tension In this article, we shall study the concept of the surface tension, its characteristics and the factors affecting it. Intermolecular Forces: Between any two molecules, there exists a force of attraction. This force is called the intermolecular force. These intermolecular forces of attraction are of two […]

Categories
Physics

Angle of Contact

Science > Physics > Surface Tension > Angle of Contact When water is taken in a glass vessel, the free surface of the water near the walls is curved concave upward. If mercury is taken in a glass vessel, the free surface of mercury near the walls is convex upwards. When the liquid is in […]

Categories
Physics

Laplace’s Law of Spherical Membrane

Science > Physics > Surface Tension > Laplace’s Law of Spherical Membrane In this article, we shall study Laplace’s Law about the excess of pressure inside a drop or a bubble of a liquid. Excess of Pressure Inside a Drop of a Liquid and Soap Bubble: Due to surface tension, free liquid drops and bubbles […]

Categories
Physics

Numerical Problems on Capillary Action

Science > Physics > Surface Tension > Numerical Problems on Capillary Action In this article, we shall study to solve problems on capillary action. Important Formulae: and Jurin’s law, hr = constant where h  =  height of liquid level in the capillary T  =  Surface tension ρ =  Density of liquid r  =  Radius of […]