State the following: S.T.P conditions.

Explanation

**Step-by-Step Solution:**

1. **Understanding STP**: The term "STP" stands for "Standard Temperature and Pressure." It is a reference point used in chemistry to provide a consistent basis for comparing gas behaviors.

2. **Standard Temperature**: The standard temperature at STP is defined as 273 Kelvin (K). This is equivalent to 0 degrees Celsius (°C).

3. **Standard Pressure**: The standard pressure at STP is defined as 1 atmosphere (atm). This is a unit of pressure commonly used in chemistry and physics.

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