A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit.heostats are a kind of potentiometer. These devices can be used in a variety of settings, and are usually designed to be sealed so that environmental factors cannot interfere with the function of the circuit.
This chemical can cause allergic rhinitis and its symptoms, including a runny nose, sneezing, and itchy eyes. In addition to tree pollen, other common allergens include: grass pollen
Rhinitis is a term implying inflammation of the nasal mucosa. There is generalised swelling of the mucosa, increased volume and viscosity of nasal secretions and impairment of normal ciliary function. Clinically, rhinitis is defined by the onset of two or more of the following symptoms - nasal discharge, sneezing, nasal itching and congestion.