Let us consider a **hemispherical capsule tank** as shown below.

Another name for such shapes is the **spherocylindrical** water tank.

**The formula for the volume calculation **

V = [Ï€r2 L + (4Ï€ r3 ÷3)]

= [Ï€ r2 × {L + (4 r ÷3)}]

Let us redraw the capsule tank with dimensions for the calculation purpose.

__Given data:__

Length = L = 2.5m.

Diameter = d = 1m.

**Volume calculation:**

Radius r = [ d ÷ 2]

= [ 1m. ÷ 2]

** r = 0.5m.**

**The volume of the capsule tank**

V = [Ï€ r2 × { L + (4 r ÷3)}]

= [3.142 × 0.52 × { 2.5m + (4× 0.5m. ÷3)}]

= [0.7855 × { 2.5m. + 0.667m}]

= [0.7855 × 3.167m]

= **2.487 cum.**

As you know, 1 cum = 1000 liter

**So, the capacity of the capsule water tank in liters**

= [2.487 cum × 1000]

= **2487 liters.**

**The capacity of the capsule water tank in US gallons**

= [2487 liters ÷ 3.785 ]

( As 1US gallon = 3.785 liters )

= **657.07 gallons.**

**Thank you for going through these calculation steps❤. Have a good day ðŸ˜„.**