What is a hand water pump? A hand water pump is simple device that pulls water up from underground. It uses mechanical motion of hands to pull the water from the underground. It has a long handle that you move up and down. When you do this, it uses air pressure and valves to pull … Read more
Balloons moving up in the air always fascinate us as children. But have you wonder why they move up in the air? The underlying principal for balloons upward movement is the same as that of objects floating on water. The balloon moves in the upward direction due to difference in the densities of the … Read more
In our daily life, we hear a lot of different sounds; sound of other people, sound of car, sound of water flowing, sound of different animals etc. Have you ever wonder how sound is generated and how do we hear it? How Sound Waves are formed? Let’s take a simple example. Throw a stone in … Read more
A vacuum flask is an insulated bottle which helps to keep the liquid inside it at the same temperature at which it was added for an extended period of time. Also known as Thermos, it works by minimizing the heat transfer between the inside and outside environment. Sir James Dewar, a Scottish scientist, invented the … Read more
No matter how big or small the water drops are, one thing common is that they are spherical when placed on flat surface. Whether you see it in the form dew on grass or water droplets tipping from the tap, they come in spherical shape. Have you ever wondered why is that so? If we … Read more
A water dropper is device that works by utilizing the atmospheric principles of atmospheric pressure of air and suction. It is also known as pipette. It has many practical applications ranging from providing controlled dose of medicine to infant to putting the droplets in eye. You will find its use in chemistry lab in order … Read more
Finding the density of solids is much easier than you think. First lets looks what the density is? Density is defined as mass per unit volume: So in order to find the density of solids, all we need is to measure the mass and volume of the solid sample and then divide mass by volume. … Read more
Have you ever noticed the gulping sound and rising bubbles when you empty a water bottle by holding it vertically downward? Have you ever wondered why this happens? Before emptying the water bottle, the atmospheric pressure inside and outside the bottles remains the same. However as you tilt the bottle downward, the water starts to … Read more
Have you have wondered that why balloons pop when you take them to mountains or any higher altitudes? Or why an unpacked bag of snacks becomes inflated and popped at times as you go up hill. The answer lies in the change of something called atmospheric air pressure. Even though we can’t see or feel … Read more