Measurement of Bulk Modulus of Fruits and Vegetables under the Negative Atomospheric Conditions

Abstract

Bulk modulus of fruits and vegetables were calculated by measuring the supporting reaction force in liquid and air under various negative atomospheric conditions. By using the same apparatus, the surface tensile strain of fruite and vegetables were also obtained that seemed to give an explanation to the cause of damaging during the process of vacuum cooling of a berry.
This method of instrumentation had tow characteristics;
(1) Volume expansion of specimen was electrically measured by using the U-gage, and recorded.
(2) By the same principle, it was possible to measure the bulk modulus under the positive pressure.
The bulk modulus of apples (KOKKO), cucumbers, tomatoes, potatoes and taroes were measued.
The results were shown in Table 2.