The UC Irvine IRMS Facility in the School of Physical Sciences and the School of Biological Sciences houses a variety of instrumentation to prepare and analyze gases, organic matter, inorganic samples, and water for stable isotope analysis. IRMS are used to measure the ratio of rare, heavy isotopes to common, light isotopes. There are five IRMS at UC Irvine to measure stable isotope ratios of the light elements: Carbon, Nitrogen, Oxygen, and Hydrogen.