A liquid of mass $1$ $kg$ is filled in a flask as shown in figure. The force exerted by the flask on the liquid is $(g = 10\ m/s^2)$[Neglect atmospheric pressure]:
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Force applied by liquid on flask $=m g=1 \times 10=10 N$
As there is no atmospheric pressure and liquid is stationary with respect to flask
so force exerted by the liquid on flask $=$ force exerted by flask on liquid $=10 N$
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