on a surface vs at a surface

Both "on a surface" and "at a surface" are correct, but they are used in different contexts. "On a surface" is used to indicate that something is physically touching or covering a surface, while "at a surface" is used to indicate proximity or location near a surface.

Last updated: March 21, 2024

on a surface

This phrase is correct and commonly used in English to indicate that something is physically touching or covering a surface.

Use "on a surface" when you want to describe something that is physically touching or covering a surface. It implies direct contact with the surface.

Examples:

The book is on the table.
There are crumbs on the floor.
The cat is sleeping on the bed.
The painting is hanging on the wall.
The cup is on the shelf.

Alternatives:

on the surface
on top of the surface
resting on the surface
lying on the surface
sitting on the surface

at a surface

This phrase is correct and commonly used in English to indicate proximity or location near a surface.

Use "at a surface" when you want to describe the location or proximity of something in relation to a surface, without necessarily implying direct contact.

Examples:

The cat is at the window.
She stood at the edge of the pool.
He placed the vase at the corner of the table.
The children were playing at the foot of the mountain.
The keys are at the bottom of the bag.

Alternatives:

near a surface
close to the surface
adjacent to the surface
by the surface
beside the surface

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on a surface vs at a surface

on a surface

at a surface

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