In its most general form, this principle is about replacing solids with liquids or gases, which can easily be channelled and have different properties such as their flexibility, which can be useful for cushioning. Pneumatic and hydraulic systems are particularly useful for channelling energy to a desired place, using flexible pipes.
Use gas and liquid parts of an object instead of solid parts (e.g. inflatable, filled with liquids, air cushion, hydrostatic, hydro-reactive).
<!–[if !supportLists]–>· <!–[endif]–>Comfortable shoe sole inserts filled with gel
<!–[if !supportLists]–>· <!–[endif]–>Store energy from decelerating a vehicle in a hydraulic system, then use the stored energy to accelerate later.