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وارد شوید

Physics for IGCSE & O level - The Earth In Space (Section 8 - No. 43)

What is a critical rule when heating any substance in a test tube?
Always point the test tube towards yourself.
Never point the test tube away from other people
Never look at the test tube during heating
Heat the test tube from the top.

توضیح

Never pointing the test tube at others is the correct procedure.

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