The body responds to irritation, infection, and injury by means of inflammation. This is caused by dust, pollen grains, and grass that are generally, harmless. When the immune system reacts contrary to its own tissues, this causes an autoimmune reaction.
Ultrasonic flow meters are devices that help calculate the flow of water by measuring the velocity of the liquid by using ultrasound. Ultrasonic flow meters are extremely useful as they particularly help in measuring the flow of waste water.