Question

how can we say the particles of matter is small

Answer 1

Hello dear....................

ᴀʟʟ ᴍᴀᴛᴛᴇʀ ɪs ᴍᴀᴅᴇ ᴜᴘ ᴏғ ᴛɪɴʏ ᴘᴀʀᴛɪᴄʟᴇs ᴄᴀʟʟᴇᴅ ᴀᴛᴏᴍs.

ᴀᴛᴏᴍs ᴄᴏᴍʙɪɴᴇ ᴛᴏɢᴇᴛʜᴇʀ ᴛᴏ ғᴏʀᴍ ᴍᴏʟᴇᴄᴜʟᴇs.

ᴀᴛᴏᴍs ᴀɴᴅ ᴍᴏʟᴇᴄᴜʟᴇs ᴀʀᴇ ᴄᴏɴsᴛᴀɴᴛʟʏ ᴍᴏᴠɪɴɢ ᴀʙᴏᴜᴛ ʀᴀɴᴅᴏᴍʟʏ ᴅᴜᴇ ᴛᴏ ᴛʜᴇɪʀ ᴛʜᴇʀᴍᴀʟ ᴇɴᴇʀɢʏ.

ᴡʜᴇɴ ᴍᴏᴠɪɴɢ ᴘᴀʀᴛɪᴄʟᴇs ᴄᴏʟʟɪᴅᴇ ᴀɢᴀɪɴsᴛ ᴇᴀᴄʜ ᴏᴛʜᴇʀ ᴏʀ ʙᴏᴜɴᴄᴇ ᴏғғ ᴀ sᴜʀғᴀᴄᴇ, ᴛʜᴇʏ ᴇxᴇʀᴛ ᴀ ғᴏʀᴄᴇ ᴏɴ ɪᴛ.

Answer 2

The term "particle" is usually applied differently to three classes of sizes. The term macroscopic particle, usually refers to particles much larger than atoms and molecules. ... The smallest of particles are the subatomic particles, which refer to particles smaller than atoms.
All matter is made up of tiny particles called atoms. Atoms combine together to form molecules. Atoms and molecules are constantly moving about randomly due to their thermal energy. When moving particles collide against each other or bounce off a surface, they exert a force on it.

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