To determine the distance to a galaxy one would only need to measure its apparent (angular) size, and use the small angle equation: a = s / d, where a is the measured angular size (in radians!), s is the galaxy’s true size (diameter), and d is the distance to the galaxy.

The average distance between galaxies is about one million light years. There are roughly 100 billion galaxies in the observable universe. Another, often-used unit of distance is the parsec. One parsec is approximately 3.26 light-years.

Parallax

Astronomical Unit

In the metric system of measurement, the most common units of distance are millimeters, centimeters, meters, and kilometers.

Kilometer (Km)is the largest unit of metric measurement. It is mainly used to measure the length (distance) of various spaces, such as the distance…

Pressure Units and Conversion The pascal (Pa) is the standard unit of pressure. A pascal is a very small amount of pressure, so the more useful unit for everyday gas pressures is the kilopascal (kPa). A kilopascal is equal to 1000 pascals. Another commonly used unit of pressure is the atmosphere (atm).

Pressure is defined as force applied per unit area. Its unit in SI system is Newton per meter square (or) Pascal.

Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. Types of Pressures are Absolute, Atmospheric, Differential, and Gauge Pressure.

Pressure is the forces exerted by particles as they bang around each other and into other things. In physics, the simple formula for pressure is P = F/A. Or in plain words, Pressure is equal to Force per unit Area. S.I Unit : Pascal. C.G.S Unit: Dyne/cm^2.

There are 2 types of forces, contact forces and act at a distance force. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.

The four main resistance forces are objects with mass, inertia, and momentum; friction; gravity; and air resistance.

Natural forces introduction

• Gravitational force.
• Electromagnetic force.
• Strong nuclear force.
• Weak nuclear force.

The forces controlling the world, and by extension, the visible universe, are gravity, electromagnetism, weak nuclear forces, and strong nuclear forces.