Both types of gravel are coated to prevent the gravel from coming into
physical contact with the water and creating a chemical reaction between the minerals in the substrate and the water.
Not exact matches
Combining superhydrophobic surfaces
with Leidenfrost levitation — picture a
water droplet hovering over a hot surface rather than making
physical contact with it — has been explored extensively for the past decade by researchers hoping to uncover the holy grail of
water - repellent surfaces.
A free, natural resource we're in
physical contact with every single day of our life:
Water.
Whether chemical or microbial, external toxins enter the body through food,
water, air, or
physical contact with skin.
Simple
physical explanation is in the huge difference in heat content of
water and air which may be in
contact with icesurface.
2)
Waters from Mexican Gulf don't have
physical contact with the Pacific
waters via Panama canal.
Panama canal has no
physical contact with both
waters.