So, let's look at an example of equilibrium in the cookie market and see what happens when things change. Let's say the equilibrium price for a chocolate chip cookie is $3. Here's an example of the supply and demand curves, with an equilibrium price of $3, which is at the intersection of the supply and demand curves.
A sigma bond is the end-to-end overlap of the bonding orbitals, usually hybrid orbitals. The sigma bond is a single bond. A pi bond is the side-to-side overlap of unhybridized p-orbitals. A pi bond, along with a sigma bond form a double bond. A triple bond is two pi bonds and a sigma bond. Take a look at this diagram showing a sigma bond and a pi bond, forming a single bond and a double bond. http://metafysica.nl/ethylene01.jpg.
Simply put, a sigma bond is a single covalent bond. The electron pair is located between the two atoms involved in the bonding. A pi bond uses the p-orbitals that are located above and below these atoms. The overlap is a pi-bond. The image above is actually only 1 pi-bond. A p-orbital is has a shape of a dumbbell.So there are 2 regions of overlapping. So, the grey bond is a sigma bond (a single bond), the clouds are a pi (this is the second bond or your double bond).he image above is actually only 1 pi-bond. A p-orbital is has a shape of a dumbbell. So there are 2 regions of overlapping. So, the grey bond is a sigma bond (a single bond), the clouds are a pi (this is the second bond or your double bond).