utplaavan bal

kisi drav mein rakhi vastu par lagne vaale bal

kisi taral (drav ya gas) mein aanshik ya poorn roop se doobi kisi vastu par upar ki or lagne wala bal utplaavan bal kahalaata hai.

utplaavan bal naavon, jalayaanon, gubbaaron aadi ke kaarya ke liye jimmedaar hai.

is siddhaant ka pratipaadan sabse pehle aarkeemideej ne kiya jo Italy ke siraikas ka nivaasi tha. yeh siddhaant is prakaar hai:

yadi koi vastu kisi taral mein aanshik ya poorn roop se doobi hai to uske bhaar mein kami hoti hai. bhaar mein yeh kami, us vastu dvaara hataaye gaye taral ke bhaar ke baraabar hoti hai.

sootr roop mein,

${\displaystyle F_{\mathrm {buoyancy} }=-\rho Vg\,}$

jahaaain V vastu ka vah aayatan hai jo taral mein dooba hai, ya taral ke andar hai.

ro = taral ka ghanatv tatha

ji = gurutv janit tvaran

• dravasthaitiki (Fluid statics)

• jal mein girna (enimeshan - 1)
• jal mein girna (enimeshan - 2)