Step 1: Understanding the Concept:
The question asks to define the atmospheric condition in hypobaric storage. The prefix "hypo-" means 'under' or 'low', and "baric" refers to pressure.
Step 2: Detailed Explanation:
Hypobaric storage, also known as low-pressure storage, is a preservation technique where produce is stored in a refrigerated, sealed chamber at a pressure well below normal atmospheric pressure (i.e., under a partial vacuum). The low pressure environment reduces the partial pressure of oxygen, which slows down the rate of respiration. It also facilitates the removal of volatile compounds like ethylene from the produce, further slowing down ripening and senescence. Therefore, the defining characteristic of hypobaric storage is a low-pressure atmosphere, usually combined with low temperature and high humidity.
Step 3: Final Answer:
In hypobaric storage, the produce is stored under a low pressure atmosphere.