Process for using a container, said container comprising: - an internal space for storing submicron particles, - a filling valve for filing the submicron particles, having an open state allowing the submicron particles to pass through the filling valve between the internal space and the exterior of the container and a closed state preventing the submicron particles from entering or leaving the internal space through the filling valve, said filling valve being equipped with locking means (33, 34, 35, 36) arranged for locking the filling valve in its closed state and for preventing the opening thereof when this filling valve is not connected to a filling pipe, - an emptying valve for emptying the submicron particles, having an open state allowing the submicron particles to pass through the emptying valve between the internal space and the exterior of the container and a closed state preventing the submicron particles from entering or leaving the internal space through the emptying valve, said emptying valve being equipped with locking means (33, 34, 35, 36) arranged for locking the emptying valve in its closed state and for preventing the opening thereof when this emptying valve is not connected to an emptying pipe, - a connector arranged in order to be open to allow passage of fluid through this connector between the exterior of the container and the internal space when it is connected to a complementary connector of a source or discharge of fluid and to be closed to prevent passage of fluid through this connector between the internal space and the exterior of the container when it is not connected to the complementary connector of the source or discharge of fluid, said process comprising the following steps: - the container is filled with submicron particles via its filling valve, at a filling site, then - the container is transported to an emptying site remote from the filling site, then - the submicron particles are emptied from the container via its emptying valve, at the emptying site, said process being characterized in that it further comprises a step of injecting liquid or gas into the internal space via the connector, this injection step comprising: - a step of injecting a gas into the internal space via the connector while the container is being emptied, and/or - a step of injecting liquid into the internal space via the connector prior to the emptying step, the container being previously filled with dry particles. - an internal space for storing submicron particles, - a filling valve for filing the submicron particles, having an open state allowing the submicron particles to pass through the filling valve between the internal space and the exterior of the container and a closed state preventing the submicron particles from entering or leaving the internal space through the filling valve, said filling valve being equipped with locking means (33, 34, 35, 36) arranged for locking the filling valve in its closed state and for preventing the opening thereof when this filling valve is not connected to a filling pipe, - an emptying valve for emptying the submicron particles, having an open state allowing the submicron particles to pass through the emptying valve between the internal space and the exterior of the container and a closed state preventing the submicron particles from entering or leaving the internal space through the emptying valve, said emptying valve being equipped with locking means (33, 34, 35, 36) arranged for locking the emptying valve in its closed state and for preventing the opening thereof when this emptying valve is not connected to an emptying pipe, - a connector arranged in order to be open to allow passage of fluid through this connector between the exterior of the container and the internal space when it is connected to a complementary connector of a source or discharge of fluid and to be closed to prevent passage of fluid through this connector between the internal space and the exterior of the container when it is not connected to the complementary connector of the source or discharge of fluid, - the container is filled with submicron particles via its filling valve, at a filling site, then - the container is transported to an emptying site remote from the filling site, then - the submicron particles are emptied from the container via its emptying valve, at the emptying site, - a step of injecting a gas into the internal space via the connector while the container is being emptied, and/or - a step of injecting liquid into the internal space via the connector prior to the emptying step, the container being previously filled with dry particles.