diff --git a/maths/prime_check.py b/maths/prime_check.py
index a757c4108f24..c87641ff4631 100644
--- a/maths/prime_check.py
+++ b/maths/prime_check.py
@@ -1,4 +1,4 @@
-"""Prime Check."""
+"""PRIME CHECK."""
 
 import math
 import unittest
@@ -7,7 +7,8 @@
 
 
 def is_prime(number: int) -> bool:
-    """Checks to see if a number is a prime in O(sqrt(n)).
+    """
+    Checks to see if a number is a prime in O(sqrt(n)).
 
     A number is prime if it has exactly two factors: 1 and itself.
 
@@ -29,14 +30,21 @@ def is_prime(number: int) -> bool:
     True
     >>> is_prime(67483)
     False
+
+    If the number entered is not whole number i.e not an integer
+    For example-
     >>> is_prime(16.1)
     Traceback (most recent call last):
         ...
     ValueError: is_prime() only accepts positive integers
+
+    If the number entered is negative integer
+    For example-
     >>> is_prime(-4)
     Traceback (most recent call last):
         ...
     ValueError: is_prime() only accepts positive integers
+
     """
 
     # precondition
diff --git a/physics/centripetal_force.py b/physics/centripetal_force.py
index a4c624582475..3fe2457f28ed 100644
--- a/physics/centripetal_force.py
+++ b/physics/centripetal_force.py
@@ -1,23 +1,11 @@
 """
-Description : Centripetal force is the force acting on an object in
-curvilinear motion directed towards the axis of rotation
-or centre of curvature.
-
-The unit of centripetal force is newton.
-
-The centripetal force is always directed perpendicular to the
-direction of the object's displacement. Using Newton's second
-law of motion, it is found that the centripetal force of an object
-moving in a circular path always acts towards the centre of the circle.
-The Centripetal Force Formula is given as the product of mass (in kg)
-and tangential velocity (in meters per second) squared, divided by the
-radius (in meters) that implies that on doubling the tangential velocity,
-the centripetal force will be quadrupled. Mathematically it is written as:
+
 F = mv²/r
-Where, F is the Centripetal force, m is the mass of the object, v is the
-speed or velocity of the object and r is the radius.
+Where, F = Centripetal Force
+       m = Mass of the Body
+       v = Tangential Velocity
+       r = Radius of Circular Path
 
-Reference: https://byjus.com/physics/centripetal-and-centrifugal-force/
 """
 
 
diff --git a/physics/ideal_gas_law.py b/physics/ideal_gas_law.py
index 09b4fb3a9c14..b2671437bc04 100644
--- a/physics/ideal_gas_law.py
+++ b/physics/ideal_gas_law.py
@@ -1,21 +1,15 @@
 """
-The ideal gas law, also called the general gas equation, is the
-equation of state of a hypothetical ideal gas. It is a good approximation
-of the behavior of many gases under many conditions, although it has
-several limitations. It was first stated by Benoît Paul Émile Clapeyron
-in 1834 as a combination of the empirical Boyle's law, Charles's law,
-Avogadro's law, and Gay-Lussac's law.[1] The ideal gas law is often written
-in an empirical form:
- ------------
- | PV = nRT |
- ------------
-P	=	Pressure (Pa)
-V	=	Volume (m^3)
-n	=	Amount of substance (mol)
-R	=	Universal gas constant
-T	=	Absolute temperature (Kelvin)
-
-(Description adapted from https://en.wikipedia.org/wiki/Ideal_gas_law )
+
+  PV = nRT
+
+Where, P	=	Pressure (Pa)
+       V	=	Volume (m^3)
+       n	=	Amount of substance (mol)
+       R	=	Universal gas constant
+       T	=	Absolute temperature (Kelvin)
+
+Description adapted from https://en.wikipedia.org/wiki/Ideal_gas_law
+
 """
 
 UNIVERSAL_GAS_CONSTANT = 8.314462  # Unit - J mol-1 K-1
@@ -32,9 +26,9 @@ def pressure_of_gas_system(moles: float, kelvin: float, volume: float) -> float:
         ...
     ValueError: Invalid inputs. Enter positive value.
     """
-    if moles < 0 or kelvin < 0 or volume < 0:
+    if moles <= 0 or kelvin <= 0 or volume <= 0:
         raise ValueError("Invalid inputs. Enter positive value.")
-    return moles * kelvin * UNIVERSAL_GAS_CONSTANT / volume
+    return (moles * kelvin * UNIVERSAL_GAS_CONSTANT) / volume
 
 
 def volume_of_gas_system(moles: float, kelvin: float, pressure: float) -> float:
@@ -48,9 +42,9 @@ def volume_of_gas_system(moles: float, kelvin: float, pressure: float) -> float:
         ...
     ValueError: Invalid inputs. Enter positive value.
     """
-    if moles < 0 or kelvin < 0 or pressure < 0:
+    if moles <= 0 or kelvin <= 0 or pressure <= 0:
         raise ValueError("Invalid inputs. Enter positive value.")
-    return moles * kelvin * UNIVERSAL_GAS_CONSTANT / pressure
+    return (moles * kelvin * UNIVERSAL_GAS_CONSTANT) / pressure
 
 
 def temperature_of_gas_system(moles: float, volume: float, pressure: float) -> float:
@@ -64,7 +58,7 @@ def temperature_of_gas_system(moles: float, volume: float, pressure: float) -> f
         ...
     ValueError: Invalid inputs. Enter positive value.
     """
-    if moles < 0 or volume < 0 or pressure < 0:
+    if moles <= 0 or volume <= 0 or pressure <= 0:
         raise ValueError("Invalid inputs. Enter positive value.")
 
     return pressure * volume / (moles * UNIVERSAL_GAS_CONSTANT)
@@ -81,7 +75,7 @@ def moles_of_gas_system(kelvin: float, volume: float, pressure: float) -> float:
         ...
     ValueError: Invalid inputs. Enter positive value.
     """
-    if kelvin < 0 or volume < 0 or pressure < 0:
+    if kelvin <= 0 or volume <= 0 or pressure <= 0:
         raise ValueError("Invalid inputs. Enter positive value.")
 
     return pressure * volume / (kelvin * UNIVERSAL_GAS_CONSTANT)