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C2  ·  33 words

Vacuum technology in Portuguese

Where almost nothing is, and why that is so hard to produce.

Practise this list

From these 33 words, as many per round as you like — up to all of them: first what is due today, then new ones. First you choose, then you fill the gap, then you write it yourself. Mistakes come back again shortly.

More about this list

Fifteenth in the list is a desgaseificação, a single noun standing where English keeps two that face in opposite directions. « Outgassing » is what a material does of its own accord: the steel wall of a chamber lets go, hour after hour, of the water and the hydrogen it took in while it stood in the workshop, and nobody asked it to. « Degassing » is what somebody does to something else: a resin, an oil or a solvent is held under vacuum until the gas dissolved in it comes out, and the agent is a person with a pump. The grammar carries the difference — one is intransitive and unwilled, the other transitive and deliberate — and a desgaseificação covers both without a flicker. The consequence shows up twice in this list. A desgaseificação das paredes is « outgassing » and never « degassing », because the wall is the one doing it, and the entry after it, o aquecimento sob vácuo, is the counter-measure, which English gives a third word again: « bakeout ». Write « degassing » of a chamber and a reader starts looking for the operator.

The words

Noun (f) (19)

Grammar for these: Definite article: o, a, os, as · Contractions: do, na, ao, pelo

a gama de pressãothe pressure rangeNoun (f)C2
Cada bomba serve uma gama de pressão diferente.Every pump serves a different pressure range.
a velocidade de bombeamentothe pumping speedNoun (f)C2
A velocidade de bombeamento cai com um tubo estreito.The pumping speed falls away with a narrow pipe.
a condutânciathe conductanceNoun (f)C2
A condutância do tubo limita tudo o que vem a seguir.The conductance of the pipe limits everything that follows.
a bomba de palhetas rotativasthe rotary vane pumpNoun (f)C2
A bomba de palhetas rotativas precisa de óleo limpo.A rotary vane pump needs clean oil.
a bomba de espiralthe scroll pumpNoun (f)C2
A bomba de espiral trabalha sem óleo nenhum.A scroll pump works with no oil at all.
a bomba turbomolecularthe turbomolecular pumpNoun (f)C2
A bomba turbomolecular roda tão depressa que se ouve mal.The turbomolecular pump spins so fast that it can barely be heard.
a bomba primáriathe backing pumpNoun (f)C2
Sem bomba primária a turbo não arranca.Without a backing pump the turbo will not start up.
a criobombathe cryopumpNoun (f)C2
A criobomba prende o gás pelo frio.A cryopump holds the gas by cold.
a desgaseificaçãothe outgassingNoun (f)C2
A desgaseificação das paredes nunca termina de todo.The outgassing of the walls never quite comes to an end.
a fuga virtualthe virtual leakNoun (f)C2
Um parafuso cego cria uma fuga virtual.A blind tapped hole creates a virtual leak.
a fuga realthe real leakNoun (f)C2
Uma fuga real deixa entrar ar de fora.A real leak lets air in from outside.
a flangethe flangeNoun (f)C2
A flange aperta-se aos poucos e em cruz.The flange is tightened little by little and crosswise.
a junta de cobrethe copper gasketNoun (f)C2
A junta de cobre usa-se uma única vez.A copper gasket is used once only.
a junta de elastómerothe elastomer sealNoun (f)C2
A junta de elastómero não aguenta o aquecimento.An elastomer seal will not stand the bakeout.
a passagem estanquethe feedthroughNoun (f)C2
Os cabos entram por uma passagem estanque.The cables come in through a feedthrough.
a câmara de cargathe load lockNoun (f)C2
A câmara de carga poupa a câmara principal.The load lock spares the main chamber.
a admissão de gásthe ventingNoun (f)C2
A admissão de gás faz-se devagar para não levantar pó.Venting is done slowly so that no dust is stirred up.
a limpeza dos componentesthe cleanliness of the componentsNoun (f)C2
A limpeza dos componentes decide o resultado.The cleanliness of the components decides the result.
a pressão finalthe ultimate pressureNoun (f)C2
A pressão final só se alcança depois de horas.The ultimate pressure is reached only after hours.

Noun (m) (14)

Grammar for these: Definite article: o, a, os, as · Contractions: do, na, ao, pelo

o vácuo primáriothe rough vacuumNoun (m)C2
O vácuo primário atinge-se em poucos minutos.Rough vacuum is reached within a few minutes.
o alto vácuothe high vacuumNoun (m)C2
Em alto vácuo as moléculas já não se encontram umas com as outras.In high vacuum the molecules no longer meet one another.
o ultra-alto vácuothe ultra-high vacuumNoun (m)C2
O ultra-alto vácuo exige aço polido e paciência.Ultra-high vacuum demands polished steel and patience.
o livre percurso médiothe mean free pathNoun (m)C2
O livre percurso médio passa a ser maior do que a câmara.The mean free path becomes longer than the chamber.
o escoamento molecularthe molecular flowNoun (m)C2
No escoamento molecular a forma do tubo conta mais do que a largura.In molecular flow the shape of the pipe counts for more than its width.
o absorvedor de gasesthe getterNoun (m)C2
O absorvedor de gases mantém o tubo limpo durante anos.The getter keeps the tube clean for years on end.
o aquecimento sob vácuothe bakeoutNoun (m)C2
O aquecimento sob vácuo dura toda a noite.The bakeout lasts all night.
o ensaio de fugas com héliothe helium leak testNoun (m)C2
O ensaio de fugas com hélio encontra o que o ouvido não ouve.The helium leak test finds what the ear cannot hear.
o caudal de fugathe leak rateNoun (m)C2
O caudal de fuga tem de ficar abaixo do valor aceite.The leak rate has to stay below the accepted figure.
o ensaio de subida de pressãothe pressure rise testNoun (m)C2
O ensaio de subida de pressão faz-se com a bomba fechada.The pressure rise test is done with the pump shut off.
o medidor de vácuothe vacuum gaugeNoun (m)C2
O medidor de vácuo foi calibrado esta semana.The vacuum gauge was calibrated this week.
o medidor de ionizaçãothe ionisation gaugeNoun (m)C2
O medidor de ionização só liga já em vácuo.The ionisation gauge switches on only once there is vacuum already.
o manuseamento com luvasthe handling with glovesNoun (m)C2
O manuseamento com luvas evita gordura das mãos.Handling with gloves keeps the grease of the hands off the parts.
o risco de implosãothe risk of implosionNoun (m)C2
Um vidro riscado traz risco de implosão.A scratched glass brings a risk of implosion.

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