Water or Mustard oil?

The answer is the tank filled with water will be emptied first . The reason lies in the fact that $\color{#3D99F6}\textbf{water is less viscous than mustard oil}$ so there will be less resistance to the motion of water molecules and hence water gets emptied with more speed and takes less time than mustard oil. The viscosity of water is so low that it is often considered as non-viscous fluid. Mustard oil has more viscosity than water and hence it's molecules experience more resistance than that of water molecules. So, mustard oil takes more time to get emptied than water.

Guys, discharge=velocity*area, Velocity=√2gh H=height, Viscosity doesn't shows up in this equation, As per this ,they should empty together. Can anybody help?

I think that the outlet is above the bottom most point of the tank, therefore both the tanks can't be emptied.

Just imagine you change the mustard oil to "glue", then the answer is obvious...

Pressure = (Density) x (acc. due to gravity) x (Height)

Since they are identical tanks and are in same value of 'g'

the pressure of the flow depends only on density

=> [ Water is more denser the mustard oil ]

[ so the pressure of flow is greater in water than in oil ]

Hence it empties first ;-)

My answer is that water is more dense than oil. Since they are both filled with the same amount then the water will be under more pressure, so it will flow out faster and empty first.

It is not only because of the viscosity, but also because the water is denser than oil, so the pressure at the bottom of the water tank is higher than the pressure at the bottom of the oil tank

How would temperature play a difference? Oil becomes less viscous as temperature climbs

Blood is thicker than water. In this case mustard oil is.

viscosity is the resistance to flow right. It turns out if you're the cook of your family, you'll notice that oil flows slowly compared to liquid water. Thus, if oil flows slowly, then it must have a hard time getting itself to be empty, on the other hand, water flows faster than oil so the ram with liquid water will be empty first

DUDE ITS MORE SIMPLE THAN YOU THOUGH. THE WATER IS LIGHTER AND LESS DENSE THAN OIL SO, IT IS OBVIOUS THAT IT WILL FLOW WAY FASTER THAN IT.

Viscosity of oil prevents it from friction free flow, therefore, it will take more time to empty as compared with water.

I'm also stumped. If viscosity or density is not the deciding factor then what is? If it has something to do with the coefficient of discharge then please tell.

Water is like water, petrol is like petrol. Unless the petrol undergoes certain frequencies unfamiliar with the systems it surrounds, then petrol will be monitored for multi-dimensional and spacial displacements and other effects, but only monitored. Petrol is emptied first.