In addition we can observe that the number of fracture drops was often less than the number of acoustic events, which was also reported by Chen et al. (2005) and Piazza et al. (2007). Castro-Prada et al. (2007) noted that the measured number of fracture drops is less than the number of acoustic events could also be because of the force registration system being slower than that of the sound due to inertia of the pressure transducer. Cheng et al. (2007) who studied the crispness of roasted almond and they found that for each major force drop a group of acoustic events seemed to happen and many sound events did not appear to be directly related to drops in force and it do not have to be one-to-one, as the sound emission is the result of a sudden release of energy, while the force curve is a reflection of the energy applied to, or released from the sample.