The unit J Pa−1 is equivalent to

JPa−1; Unit of work is Joule and unit of pressure is Pascal.Dimension of Joule, i.e., work=F  ×  L=MLT−2  ×  L=  ML2T−21Pa =1Pressure = 1F=1 × AF  =  M−1 LT−2So,   JPa−1  =  L2 ×  L =  L3