Methane's boiling point is about 110K, compared to hydrogen's 20K. This means that both fuel and oxidizer lines can be purged with gaseous nitrogen. Liquid hydrogen lines can only be purged with helium, as hydrogen's boiling point is below the melting point of other inert gases.
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Engineering Intern Salary. The average wage for an Engineering Intern is $16.19 per hour. The highest paying skills associated with this job are C, Geographic Information Systems (GIS), and Java. Most people move on to other jobs if they have more than 10 years' experience in this field.