1 dm^3 is equivalent to 0.001 m^3 because there are 10 decimeters in a meter. Therefore, if we have 1 cubic decimeter (dm^3), we can convert it to cubic meters (m^3) by dividing by 10. This gives us 0.1 m^3. Since the question asks for the equivalent in m^3, the correct answer is 0.001 m^3, which is the same as 1 dm^3.