This can be applied to armor update ticks to spawn particles when the entity jumps up in the air.

 Condition: Tests if "Entity y velocity" is grater than "0.1" (Entity y velocity > 0.1). Event: Spawns 10 particles at current location with a area of 1 block with the speed of 1. Tips: Use ">" (grater than) to test for positive coordinates. Use "<" (less than) to test for negative coordinates. You can also use "Entity x velocity" to test for ( East (>) and West (<) ) directions. Or you can use "Entity z velocity" to test for ( South (>) and North (<) ) directions.