Jules
In SI, specific heat capacity is measured in joules per kilogram kelvin.
specifc heat is measured by units
The "specific heat capacity" is simply the heat capacity per unit - it might be per mass unit, per volume unit, or per amount of moles.
Capacity isn't a unit at all. It's a characteristic, or a property of an item, which can be measured in whatever suitable unit. Capacity of batteries is measured in amp hours. Capacity of a gas tank can come in either liters or gallons.
"SI unit" and "metric unit" basically means the same. The only metric system used nowadays is the SI. For a specific object, the heat capacity is measured in J/K. To compare different materials, it is of interest to specify the heat capacity PER KILOGRAM, so the units are J / (K times kg). It is also possible to specify heat capacity in J / (K times mole). This would also be SI units.
The BTU (British Thermal Unit) is a quantity of heat. An air conditioner has the capacity to move a certain amount of heat from the inside of your house to the outside, and that can be measured in BTUs.
Heat is measured in unit of what...
Specific heat capacity is the heat capacity per unit mass, and is expressed as
Yes, heat can be measured in degrees Fahrenheit, which is a unit of temperature commonly used in the United States.
A processor is not a unit of capacity. It is its worth on processing information; how quickly. Not something that holds information.
In the US, a fish tank's capacity is measured in gallons.
Capacity in the sense of volume is measured in cubic metres, although litres (0.001m3) are common. Electrical capacitance is measured in farads.