A celluloid ball(i. e, a table tennis ball) has the permeability for helium and may be used as a soil helium gas collector when burried in the soil.
赛璐珞球（乒乓球）具有渗透氮气的性质，埋于土壤中可作为氦气的收集器。
A celluloid ball(i. e, a table tennis ball) has the permeability for helium and may be used as a soil helium gas collector when burried in the soil.
赛璐珞球（乒乓球）具有渗透氮气的性质，埋于土壤中可作为氦气的收集器。
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