Anger is a very strange emotion to experience. While it's not unfamiliar, it's almost always a different experience each instance it's felt. The anger from when you spills a glass of water over some important work feels very different from when you're arguing with someone who you thought had the same emotional intelligence as you. I equate the two instances, because the sources are different but the intensity is the same. The anger felt from an internal reason compared to an external reason is so different, but putting them at the same intensity shows how similar they actually are.
If you were ever on 2014 tumblr at some point, you would have probably come across an text post that talked about two types of anger: wet and dry. The "wet" type of anger was described as the feeling of getting choked up, tears about to come out, and the feeling just before you start to cry. The "wet" type of anger can be thought of as a very reflexive response, more to-the-point, and overall encapsulates the feeling of "being done" in the instance. As I've gone about my life, I've felt both forms and noticed that the "wet" anger has more of an emotional attachment than "dry" anger, and "dry" anger has quicker response time rather than holding it in like "wet" anger.
Now that the types have been indentified, sources are equally important. The terms "internal" and "external" are pretty self explanatory, but just to clarify, "internal" is yourself or your past actions that are acting as the source, while "external" is outside resources resulting in anger. Now there are a lot of "internal" reasons why anger is happening, including (but not limited to) trauma, mental illness, or (in all reality) a minor inconvenience. With "external" anger, sources could include another person, the news, or even an object. I know we've all seen something and instantly gotten angry over it.
While this was more of an exploration into the types of anger rather than anger itself, all these fall very well onto an alignment chart. The y axis could be the type and the x could be the sources, but we don't have to get into the math of it here. Ultimately, the source relates to the type that's expressed. Anger is an emotion that is expressed when we feel there has been an injustice done to us as a person. Understanding that can help explore the emotion further.
I understand this could be a strange request, but the next time you experience anger I implore you to try and analyze where it's coming from and your reaction to it. It honestly helped me so much with understanding not only my emotions, but myself as a person. Anger is a very foreign emotion, to understand it will be an uncomfortable moment. But being able to analyze it turns it into such a beautiful thing.