What's air balloon

Hot air balloon flight is the first by human technology, invented by the Montgolfier brothers in Annonay, France in 1783. The first flight by man was held on 21 November 1783, in Paris by Pilatre de Rozier and the Marquis d'Arlandes. Hot air balloon can be controlled and not only brought winds known as airships or thermal airship.
Hot air balloons give lift force due to the hot air inside the balloon is lighter than the air outside the balloon. Air balloon works is based on the principle of Archimedes Law. According to this principle, it can be stated that a body that surrounded the air will experience a lift force equal to the volume of air displaced by the object.

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Archimedes law

FA=ρ_f..V_f..g

With: FA = Upward force (N),
ρ_f = The density of the fluid(kg/m³),
V_f = volume of the fluid displaced (m³), dan
g = acceleration of gravity (m/s²).
 It can be seen that the magnitude of the upward force experienced by objects in the fluid depends on the density of the fluid, the volume of displaced fluid, and the acceleration of Earth's gravity. You have to know that an object that is in the fluid may float, float, or sink, the following description.

a. Terapung

Object immersed in a fluid will float if the density of the object is smaller than the density of the fluid (ρb <ρf). The density of objects floating in the fluid meets the following equation.

atau

with: V_bf = volume of the object submerged in a fluid (m³),
V_b = volume objects (m³),
h_bf = high objects submerged in fluid (m),
h_b = height objects (m),
ρ_b = density of objects (kg/m³), and
ρ_f = the density of the fluid(kg/m³).
b. Melayang
Object immersed in a fluid will float if the density of objects with fluid density (ρb = ρf). Can you give examples of objects that float in liquid water?
c. Tenggelam
Object immersed in a fluid will sink if the density of the object is greater than the density of the fluid (ρb> ρf). If the object is immersed in a fluid can be weighed in the fluid, the weight of the object will be

or

with: w_bf = body weight in fluid (N), and
w = weight of the object in the air (N).

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