Question

What is viscosity ? ​

Answer 1

Answer:

Viscosity:

• It is the property of liquid by which an internal frictional force acting between two layers called viscosity.
• Unit - Poiseulie in MKS and Poise in CGS system.
• 1 Poiseulie = 10 Poise
• Dimension = [M¹L⁻¹T⁻¹]

Explanation:

Derivation:

Experimentally it is found that viscous drag force or frictional force is directly proportional to area of layers, velocity gradient and it is also known as Newton's Viscosity formula,

$\longrightarrow \sf F\propto A\Bigg(\dfrac{dv}{dz}\Bigg)\\ \\ \\ \longrightarrow \sf F=\eta A\dfrac{dv}{dz}\\ \\ \\ \longrightarrow \sf \eta =\dfrac{F}{A.\dfrac{dv}{dz}}$

Where,

• η = Coefficient of viscosity.

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Answer 2

ᗩᑎSᗯƐᖇ

ᴛʜᴇ ᴠɪsᴄᴏsɪᴛʏ ᴏғ ᴀ ғʟᴜɪᴅ ɪs ᴀ ᴍᴇᴀsᴜʀᴇ ᴏғ ɪᴛs ʀᴇsɪsᴛᴀɴᴄᴇ ᴛᴏ ᴅᴇғᴏʀᴍᴀᴛɪᴏɴ ᴀᴛ ᴀ ɢɪᴠᴇɴ ʀᴀᴛᴇ. ғᴏʀ ʟɪǫᴜɪᴅs, ɪᴛ ᴄᴏʀʀᴇsᴘᴏɴᴅs ᴛᴏ ᴛʜᴇ ɪɴғᴏʀᴍᴀʟ ᴄᴏɴᴄᴇᴘᴛ ᴏғ ᴛʜɪᴄᴋɴᴇss.