Pressure measurement because atmospheric pressure is always changing and the reference in this case is fixed at 1 bar. To produce an absolute pressure sensor, the manufacturer seals a high vacuum behind the sensing diaphragm. If the process-pressure connection of an absolute-pressure transmitter is open to the air, it will read the actual barometric pressure. The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N·m or kg·m·s). This special name for the unit was added in 1971; before that, pressure in SI was expressed in units such as N·m. When indicated, the zero reference is
Comparison of Object Pascal and C the ASCII character set codice_47 and codice_48 is a TAB character. In addition to codice_49 type, Object Pascal also has codice_50 to represent Unicode characters. In C, this is usually implemented as a macro or codice_16 with name codice_52, which is simply an alias for codice_24. In Pascal, boolean is an enumerated type. The possible values of boolean are false and true, with ordinal value of false=0 and true=1, other values are undefined. For conversion to integer, ord is used: There is no standard function for integer to boolean, however, the conversion is simple in practice: C has binary valued