ozone treatment decreased the weight loss of samples noticeably. Weight loss of ozone treated samples was 0.06% less than that of control samples. Meanwhile the use of 15 minute ozone treatment had a significant effect on samples water loss (figure 3). It seems the life of fresh grapes is considered under the influence of berries and cluster's weight loss. Sample weight loss happens due to water loss and the reduction in stored materials in the process of respiration. Ozone leads to increased dehydration of samples if it is used in high concentrations which cause damage to epidermis and cuticle tissue of the fruit.