| Cold water is denser than hot water, he explains, so it provides more buoyancy. |
| Water's buoyancy makes a swimmer feel weightless and reduces stress on joints in the spine, hips and knees. |
| They are made of high buoyancy foam and will float with guns and ammunition inside. |
| The snorkel, flippers, and goggles are definitely material objects, as are the air tank, the regulator, and the buoyancy control device. |
| Pet life jackets do not come with buoyancy ratings, as do human life jackets. |
| Kitted out with helmets, wetsuits, buoyancy aids and paddles, our team piles into two inflatable rafts, drifting gently downriver. |
