at one-hour intervals
- Examples
| The test substance is mixed with distilled water at 20 oC and the rate of evolution of gas is measured over a period of seven hours, at one-hour intervals. | Se mezcla la sustancia de ensayo con agua destilada a 20 oC y se mide la velocidad de producción de gas durante 7 horas, a intervalos de una hora. | 
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