Question

ᴡʜᴀᴛ ɪꜱ qᴜᴀɴᴛᴀᴍ ᴩʜyꜱɪᴄꜱ.
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ʜᴇʟʟᴏ
ᴍᴀɴɪꜱʜᴀ​

Answer 1

it's the physics that explains how everything works: the best description we have of the nature of the particles that make up matter and the forces with which they interact.