Buoyancy units are usually which two forms?

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Multiple Choice

Buoyancy units are usually which two forms?

Buoyancy units in water survival gear come from two reliable sources that provide positive flotation: air-filled inflatables and closed-cell foam. Air tanks enable rapid buoyancy by inflating a bladder or chamber when needed, giving quick rise to the surface. Closed-cell foam, like unicellular plastic foam, traps air in its cells and remains buoyant even if other systems fail, providing steady, maintenance-free flotation. Together, these two forms cover both active inflation-based buoyancy and passive buoyancy that doesn’t rely on a powered system. Other options don’t fit as well. Water ballast adds weight and reduces flotation, cork is buoyant but not a standard buoyancy unit in many survival devices, and metal cylinders or solid foam don’t represent the common two-form approach used in typical equipment, where the paired forms are air-tank inflation and foam buoyancy.

Buoyancy units in water survival gear come from two reliable sources that provide positive flotation: air-filled inflatables and closed-cell foam. Air tanks enable rapid buoyancy by inflating a bladder or chamber when needed, giving quick rise to the surface. Closed-cell foam, like unicellular plastic foam, traps air in its cells and remains buoyant even if other systems fail, providing steady, maintenance-free flotation. Together, these two forms cover both active inflation-based buoyancy and passive buoyancy that doesn’t rely on a powered system.

Other options don’t fit as well. Water ballast adds weight and reduces flotation, cork is buoyant but not a standard buoyancy unit in many survival devices, and metal cylinders or solid foam don’t represent the common two-form approach used in typical equipment, where the paired forms are air-tank inflation and foam buoyancy.

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