Answer :
Final answer:
The valve cap on a gas cylinder primarily serves to protect the cylinder valve from damage, i.e., Option C.
Explanation:
The role of a valve cap on a gas cylinder is primarily protective. It does not prevent gas from escaping if the cylinder valve leaks, nor does it prevent the cylinder valve from breaking off if the cylinder falls. Instead, its function is to protect the cylinder valve from damage, such as scratches or impacts that might affect the valve's functionality.
It definitely should be in place when the tare weight (the weight of an empty cylinder) is being measured to ensure accuracy, thereby eliminating any variances that could result from the absence or presence of the cap.
'Tare weight' refers to the weight of the empty gas cylinder, while 'cylinder valve' is the component of the cylinder that regulates the escape of gas. It's integral to maintain the integrity of the valve to ensure safety and proper function of the gas cylinder.
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