Explanation:
SI base unit of thermodynamic temperature is kelvin (K). Celsius is derived unit, size 1°C = 1 K. Fahrenheit and Reaumur are other scales. Kelvin scale starts at absolute zero.
Explanation:
A vector quantity possesses both magnitude and a specific spatial direction, and it must obey the laws of vector addition. Electric field intensity is a vector (force per unit charge, having the direction of the force). Electric current has a direction in circuits but adds algebraically like a scalar (violating vector addition). Charge and potential are standard scalars.
Explanation:
Telescope (refracting/reflecting) makes distant objects appear nearer, magnified. Microscope for tiny near objects. Periscope uses mirrors to see over obstacles. Endoscope medical.
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