Write down formula for the rate of cooling under natural convection define all symbol?

The formula for the rate of cooling under natural convection is given by:

q = h * A * ΔT

Where:
q = rate of cooling (W)
h = convective heat transfer coefficient (W/m^2*K)
A = surface area of the object (m^2)
ΔT = temperature difference between the object and the surrounding fluid (K)

Formula for the Rate of Cooling Under Natural Convection:

```
Q = hA(T_s - T_∞)
```

where:

- Q is the rate of cooling (heat transfer rate), in Watts (W)
- h is the convective heat transfer coefficient, in Watts per square meter per Kelvin (W/(m²K))
- A is the surface area of the object, in square meters (m²)
- T_s is the surface temperature of the object, in Kelvin (K)
- T_∞ is the ambient temperature, in Kelvin (K)

Symbol Definitions:

- Q: The rate at which heat is transferred from the object to the surrounding air.
- h: A measure of the efficiency of the convection process. It depends on the properties of the fluid (air in this case), the flow conditions, and the geometry of the object.
- A: The surface area through which heat is transferred.
- T_s: The temperature of the object's surface.
- T_∞: The temperature of the air surrounding the object.