Science Experiment
Hello, this is my first science experiment in this blog.
Today’s topic is OOBLECK
Introduction
Oobleck is a non-newtonian fluid. That is, it acts like a liquid when being poured, but like a solid when a force is acting on it. You can grab it and then it will ooze out of your hands. Make enough Oobleck and you can even walk on it!
Materials
– 1 cup water
– 1.5-2 cups cornstarch
– a few drops of food colouring of your choice(if you want to. Not necessary)
What is Non-newtonian fluid?
A non-Newtonian fluid is a fluid that does not follow Newton’s law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid. Many salt solutions and molten polymers are non-Newtonian fluids, as are many commonly found substances such as custard, honey, toothpaste, starch suspensions, corn starch, paint, blood, melted butter, and shampoo.
Viscosity: The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of “thickness”: for example, the syrup has a higher viscosity than water.
What is Newtonian fluid then?
A Newtonian fluid is a fluid in which the viscous stresses arising from its flow, at every point, are linearly correlated to the local strain rate—the rate of change of its deformation over time. That is equivalent to saying those forces are proportional to the rates of change of the fluid’s velocity vector as one moves away from the point in question in various directions.
I hope you learnt something new today.
Bye! Have a great time.
Science Maniac 