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).
Spawns 10 particles at current location with a area of 1 block with the speed of 1.
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.