Final answer:
Intradermal injections are used for skin tests and involve small volumes, typically less than 0.5 mL, using a 26 to 28 gauge needle, into the dermis layer at a 10 to 15 degrees angle.
Step-by-step explanation:
Intradermal injections are commonly used for skin tests, such as tuberculosis or allergy testing. The volume administered is usually small, typically less than 0.5 mL. The syringe used is often a 1 mL tuberculin syringe. The gauge of the needle is typically between 26 and 28, which is small in diameter to minimize tissue trauma. As for the skin, the injection is given into the dermis layer, which is located just below the epidermis and above the subcutaneous tissue. The angle of the needle should be about 10 to 15 degrees with the bevel up, to ensure the needle remains within the dermis.
The details provided about the hypodermic syringe and its flow rate, while interesting in a physics or engineering context, are not directly related to the practice of delivering intradermal injections in a medical setting.