Surface tension

Have you ever played soap bubbles? Soap bubble round. Funny. Can be blown. After flying, soap bubbles burst. Wow, it’s fun, a childhood game. Why is soap bubble round? Please wake up in the morning, then notice the leaves around the house. Observe the droplets of dew attached to the leaves. It’s strange; dew drops …

Surface tension Read More »

Archimedes’ principle

A ship with a huge mass does not sink, while a stone that has a small size can sink. Why is that? The answer is straightforward if you understand the concept of buoyancy and Archimedes’ principle. In everyday life, we will find that objects that are inserted into a fluid, like a rock, have a …

Archimedes’ principle Read More »

Pascal’s principle

How is the working principle of a hydraulic lift used to lift a car? What is the working principle of hydraulic brakes when used to reduce the car’s speed? Please learn Pascal’s Principle to understand this. Every fluid is always exerting pressure on all objects that in contact with it. The water we put in …

Pascal’s principle Read More »

Pressure in fluids

In physics, the pressure is defined as force per unit area, where the direction of the force is perpendicular to the surface area. Mathematically, pressure is expressed by the equation P = F / A, where P = pressure, F = force and A = surface area. Force unit (F) is Newton (N), the unit …

Pressure in fluids Read More »

Density and specific gravity

Density One important characteristic of a substance is density. Density is the ratio of mass to volume. Mathematically written: ρ = m / V ρ (rho) is a Greek letter commonly used to express density, m is mass and V is volume. The density of the homogeneous fluid is different from the density of a …

Density and specific gravity Read More »

Equation of continuity

Try to open the water tap slowly while paying attention to the speed of the water coming out of the mouth of the faucet. Now compare, where is the rate of water flow faster, when the mouth of the faucet is closed or not? Why is that? To understand this, please learn the continuity equation. …

Equation of continuity Read More »

Black principle

1. Definition of Black principle If we mix hot and cold water in an open container (for example a bucket), heat transfer from hot water to cold water. Because the container is open, then some heat moves into the air. The container also becomes warmer. Heat released by hot water is not only absorbed by …

Black principle Read More »

Heat transfer by radiation

1. Definition of the heat transfer by radiation How does it feel if you wear black clothes on a hot day or when you are exercising during the day? Compare with when you wear white clothes? If you wear black clothes during the day, then you feel hot. Why is that? The distance between the …

Heat transfer by radiation Read More »