rough order of magnitude (ROM) Definition. An estimate of costs and time provided in the early stages of a project when its scope and requirements has not been fully defined. An ROM is used to reduce the uncertainty of cost outcomes for both parties when project details have yet to be identified. Use this term in a sentence.
Prior To Fitting Your Wickes Water Softener. The water softener must be installed inside a plastic water tank, this tank should then be you may hear a hissing noise as the water rushes through the valve. Once the hissing noise has stopped, open the outlet valve and run some water.
Here is my personal account of one such quench: The only warning of the impending quench was 5-10 seconds of a mild hissing sound caused by a small volume of helium escaping through the boil-off valve. Roaring or loud hissing then followed for about 20-30 seconds as great quantities of gaseous helium were released.