How Convert kilo-pascal into watt?

A kiloPascal is a measure of pressure, not power or work. It has 1 kPa = 1000 N/m^2 while 1 Watt = 1J/s = 1 Nm/s. Work must be measured in units of force*distance, like Nm or ft lbf. Also Watts measure power which is work/time.

As a result, it is not possible to convert Kpa to Watt.