Physics Universe

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#credit:Atta Ur Rehman sir  #physics is fun.

Liquid pressure is always perpendicular to surface area under consideration. •               Pressure acts equally in all possible directions. •               Liquid pressure depends on depth (h) of point below free surface, density  of liquid and acceleration due to gravity (g) at the place. •               Liquid pressure is independent of amount of liquid, shape of vessel and area of consideration. So a given liquid is filled in vessels of different shapes to same heights then pressure at the base of each vessels will be same. •               Pressure will be same at all points in a liquid lying at the same level. Therefore the height of liquid level at rest is equal in all vessels of different shapes and sizes when the...

UNIT & DIMENSION (PART I) 1. INTRODUCTION: Physics is an experimental science and experiments require measurement of physical quantities. Measuring a physical quantity involves comparing the quantity with a reference standard called the unit of the quantity. Some physical quantities are taken as base quantities and other quantities are expressed in terms of the base quantities called derived quantities. This forms a system of base quantities and their units.   2. UNITS  To measure a physical quantity we need some standard unit of that quantity. The measurement of the quantity is mentioned in two parts, the first part gives magnitude and the second part gives the name of the unit. Thus, suppose I say that length of this wire is 5 meters. The numeric part 5 says that it is 5 times of the unit of length and the second part meter says that unit chosen here is meter.    2.1 Fundamental and Derived Quantities  The basic physical quantities, wh...