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The phrase "at a room" is not correct and usable in written English.
It is typically incorrect because the preposition "at" is not used with "room" in this context; "in a room" is the correct form.
Example: "We will meet in a room to discuss the project details."
Alternatives: "in a room" or "inside a room".
Exact(60)
All experiments reported here were performed at a room temperature.
However, the previous measurements of thermal properties have been performed only at a room temperature.
On the fifth floor the group looked at a room given over to taxidermy.
This results in a barrier of around 2 eV, prohibitive at a room temperature.
It is the first thing that strikes you when you look at a room.
The experimental program was designed and proportional tests carried out at a room temperature on aluminium alloy 2024-T351.
He had come to look at a room for rent and I showed him around nervously.
And a Senate Republican was also harvesting $350 per donor at a room nearby.
The two Democrats plan a separate reception at a room within the convention center.
On a recent evening, he stared out at a room of students and aspiring journalists, hesitated and then smiled.
So they wait — Mr. and Ms. Preece at a room in a downtown hotel, their son in a city orphanage.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com