Physical changes in stored apples

The longitudinal distribution of mass and volume in Cox's Orange Pippin apples altered during storage in air or in a controlled atmosphere. The proportions of both mass and volume in the central zone increased significantly during the first week and subsequently declined, with corresponding changes at the calyx and stalk ends of the fruit. The density of the whole fruit declined continuously during storage. The volume of apples stored in high humidity increased. These effects are discussed in relation to changes found previously in calcium distribution within apples and in fruit firmness during storage.