While heating water, bubbles begin to form at the bottom of the vessel. After a while, they detach and rise. Consider a bubble to be a sphere of radius R and making a circular contact of radius r with the bottom of the vessel. Here, r<<R, the surface tension of water is T, and density of water is ρw. The value of r, just before the bubble detaches is,

While heating water, bubbles begin to form at the bottom of the vessel

1.	While heating water, bubbles begin to form at the bottom of the vessel. After a while, they detach and rise. Consider a bubble to be a sphere of radius R and making a circular contact of radius r with the bottom of the vessel. Here, r<<R, the surface tension of water is T, and density of water is ρw. The value of r, just before the bubble detaches is,
Answer» While heating water, bubbles begin to form at the bottom of the vessel. After a while, they detach and rise. Consider a bubble to be a sphere of radius $R$ and making a circular contact of radius $r$ with the bottom of the vessel. Here, $r << R$ , the surface tension of water is $T$ , and density of water is $ρ_{w}$ . The value of $r$ , just before the bubble detaches is,

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