Question

A. Why cannot you separate the mixture of salt and fine sand by sieving
B. Why cannot you separate the mixture of salt and fine sand by winnowing

~~~ ANY USELESS COMMENT WILL BE DELETED ~~~

Answer 1

1. ᴡᴇ ᴄᴀɴɴᴏᴛ sᴇᴘʀᴀᴛᴇ ᴛʜᴇ ᴍɪxᴜʀᴇ ᴏғ ᴛʜᴇ sᴀʟᴛs ᴀɴᴅ ғɪɴᴇ sᴀɴᴅ ʙʏ sɪᴇᴠɪɴɢ ʙᴇᴄᴀᴜsᴇ sᴀɴᴅ (ᴍᴏsᴛʟʏ sɪʟɪᴄᴏɴ ᴅɪᴏxɪᴅᴇ) ɪs ɴᴏᴛ.

2. ᴡᴇ ᴄᴀɴɴᴏᴛ sᴇᴘʀᴀᴛᴇ ᴛʜᴇ ᴍɪxᴛᴜʀᴇ ᴏғ ᴛʜᴇ sᴀʟᴛ ᴀɴᴅ ғɪɴᴇ sᴀɴᴅ ʙʏ ᴡɪɴɴᴏᴡɪɴɢ ʙᴇᴄᴀᴜsᴇ sᴀʟᴛ ᴀɴᴅ sᴀɴᴅ ᴄᴀɴ ʙᴇ sᴇᴘᴀʀᴀᴛᴇᴅ ʙʏ ᴍɪxɪɴɢ ᴛʜᴇ ᴛᴡᴏ sᴜʙsᴛᴀɴᴄᴇs ᴡɪᴛʜ ᴡᴀᴛᴇʀ. ᴛʜᴇ sᴀʟᴛ ᴡɪʟʟ ᴅɪssᴏʟᴠᴇ ɪɴᴛᴏ ᴛʜᴇ ᴡᴀᴛᴇʀ, ᴡʜɪʟᴇ ᴛʜᴇ sᴀɴᴅ ᴡɪʟʟ sᴇᴛᴛʟᴇ ᴀᴛ ᴛʜᴇ ʙᴏᴛᴛᴏᴍ ᴏғ ᴛʜᴇ ᴍɪxᴛᴜʀᴇ.

︎︎︎︎ ︎︎︎ ︎︎︎︎︎ ︎︎︎

Answer 2

The aggregate should be oven-dried at high temperature before sieving to prevent lump formation of the fine particles due to moisture content, which might clog the fine sieve holes.