(1 micronewton / watt)^-1 Units cancel out to give m/s. This is just specific impulse. Though Isp is generally measured in seconds (implied gravitational fiel

(1 micronewton / watt)^-1 Units cancel out to give m/s. This is just specific impulse. Though Isp is generally measured in seconds (implied gravitational field of the Earth gives s * m/s/s = m/s.)