Its nothing, just a vacuum
The air spaces in the lungs are called pulmonary alveoli. They are where gas exchange occurs in the lungs of mammals.
a rock that is full of tiny, connected air spaces is PERMEABLE
pore space
The spaces between particles of soil are filled with air and water, as well as organic matter and minerals. These spaces are important for allowing roots to access oxygen, nutrients, and water, which are essential for plant growth.
Particles of matter can pass through substances with spaces between their molecules, such as air, water, and some solids.
mineral Organic matter (rotting plant and animal parts) air spaces and waterby moreluck
breathing
Air pockets found in soil are called pore spaces or soil pores. These spaces exist between soil particles and contain a mixture of gases such as oxygen, carbon dioxide, and nitrogen. They are critical for maintaining proper aeration and facilitating nutrient uptake by plant roots.
The type of bone that contains air spaces is called spongy or cancellous bone. This type of bone is less dense than compact bone and is characterized by a mesh-like structure that provides support while making bones lighter. Spongy bone is primarily found at the ends of long bones and in the interior of flat bones.
A vacuum.
Matter
Soil contains air in the spaces between the soil particles called pore spaces. These pore spaces allow for the infiltration of air into the soil, providing oxygen for root respiration and promoting beneficial soil microbial activity. Adequate soil aeration is critical for healthy plant growth and overall soil health.